HSC Physics Marathon 2013-2015 Archive (1 Viewer)

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mrpotatoed

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hmm yeah fair enough.

Discuss planck and Einstein's differing views about whether science research should be removed from social and political forces
5 marks

p.s: thank god English is over, now I can live in maths and physics for the next two weeks
 

Mr_Kap

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re: HSC Physics Marathon Archive

hmm yeah fair enough.

Discuss planck and Einstein's differing views about whether science research should be removed from social and political forces
5 marks
Not sure about this one but I'll give it a go:

Both Einstein and Planck initially held differing views as to the relationship between science and politics,
however eventually "discovered" they were closely linked.

Einstein was an anti-war pacifist, meaning that initially he refused to support politics and war through the help of science. Hence, this is why he believed that science was removed from social and political forces. However, in the end he came to an sudden and unexpected discovery, which was especially confronting and provocative, that the two are in fact linked together. The ramifications of this this led him to reconsider his previous notions and what was 'known', hence helping with the Manhattan project which almost certainly contributed to the ending of the war. He still believed that they should be removed in an ideal world however, only helping in fear of Germany creating the same nuclear bomb.

Planck initially felt science had a role to play for in politics, eventually though, he turned away from the Nazi Regime criticising it, believing science should be separate. However, he understood that there is an unavoidable link between science and politics. Even after Planck attempted to separate science from politics, research science for the military continued through
other scientists.
 

PhysicsMaths

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re: HSC Physics Marathon Archive

Not sure about this one but I'll give it a go:

Both Einstein and Planck initially held differing views as to the relationship between science and politics,
however eventually "discovered" they were closely linked.

Einstein was an anti-war pacifist, meaning that initially he refused to support politics and war through the help of science. Hence, this is why he believed that science was removed from social and political forces. However, in the end he came to an sudden and unexpected discovery, which was especially confronting and provocative, that the two are in fact linked together. The ramifications of this this led him to reconsider his previous notions and what was 'known', hence helping with the Manhattan project which almost certainly contributed to the ending of the war. He still believed that they should be removed in an ideal world however, only helping in fear of Germany creating the same nuclear bomb.

Planck initially felt science had a role to play for in politics, eventually though, he turned away from the Nazi Regime criticising it, believing science should be separate. However, he understood that there is an unavoidable link between science and politics. Even after Planck attempted to separate science from politics, research science for the military continued through
other scientists.
15/15
 

mrpotatoed

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re: HSC Physics Marathon Archive

you forgot to add a question so w/e ill add another

assess the impact of transistors on society (6 marks)
 

Mr_Kap

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you forgot to add a question so w/e ill add another

assess the impact of transistors on society (6 marks)
Transistors have had mostly positive impacts on society.
Transistors are devices used for the amplification of signals in communication technologies. Before transistors, thermionic diodes were used to achieve this. There were many problems associated with the use of thermionic diodes however, including its large and fragile nature as a result of the vacuum created inside the glass covering, its unreliability, and the substantial heat released. Through the development of transistors, communication technology become more superior as it was now cheaper, smaller, and developed at a greater rate. This shows the positive impact on society.

The invention of the transistor through their use in microprocessors and microchips has also dramatically changed society. They have enabled the building of small, efficient computers that now have widespread applications throughout society as well as in scientific research. It has also allowed the automation of repetitive tasks which has led to higher quality of life. However, its negative impact can be seen from this, as many unskilled jobs performed by humans become redundant and this led to a rise in unemployment. In terms of communication, it has had a tremendous benefit enabling the internet which has drastically changed society for the better.

ASSESMENT: So overall transistors have had an extremely positive impact on society, largely seen through their use in microprocessors and microchips, cheaper communication technology, and the eventual construction of the internet as a result of these computers built using transistors. The only disadvantage is that it raised unemployment when transistors were first introduced into society, however the benefits greatly outweigh this disadvantage.

----------------------------------------------------------------------------------------------------------------
What mark would i have gotten out of 6?
----------------------------------------------------------------------------------------------------------------

New Question: Describe what superconductivity is and discuss applications of it to developing technologies. 5 MARKS
 
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mrpotatoed

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----------------------------------------------------------------------------------------------------------------
What mark would i have gotten out of 6?
----------------------------------------------------------------------------------------------------------------

New Question: Describe what superconductivity is and discuss applications of it to developing technologies. 5 MARKS
Probably a 3-4 to be honest, you shouldn't have all the description about the function at the start, it is useless for the question where you need to assess how it affects society, not why transistors are now used. That first sentence of your assessment should be the first sentence of your answer so you give a strong assessment first up, and then jump straight into advantages. You also need to be more indepth with advantages and disadvantages. When you say microprocessors and microchips, you need to then say that it is used in computers ( you didn't explicity say microchips are used in computers) and robotics which then allows for increased leisure through the automation of repetitive tasks (eg car manufacturing). Also, you need to say why microchips are an advantage, (they allow for the miniaturisation of circuits and faster processing).

Assess questions are like a mini essay, like the last short answer of paper 1. You need to convince the marker that you answering the question (assess) and provide a strong view. Use high modality language, no need to say 'mostly positive'. Just say extremely positive first up and then prove why that is so.

may seem harsh but I had to learn this the hard way lol, better to see this now than after the hsc I suppose

---------------

Superconductivity refers a state of zero resistance. Electrons are able to pass through the lattice with zero resistance due to there being no lattice vibrations when the conductor has dropped below the critical temperature. A current in a superconductors never dissipates.

Applications of superconductivity are to potentially use them in power lines. However, whilst this will allow for the transmission of power will no energy loss, compared to approximately 15% energy loss today, the energy saved is less than the energy used to produce liquid helium to keep the transmission lines below critical temperature. Type 2 superconductors are a potential alternative with a much higher critical temperature, allowing for the cheaper liquid nitrogen to be used. Type two superconductors are very brittle though and are difficult to mould into a wire. This means that superconductors are currently unviable for power transmission.

Superconductivity can also be used in Mag-Lev trains whereby large magnetic fields can be produced to levitate and propel a train with zero friction. This allows for high speeds to be reached with little track maintenance. As previously mentioned, the liquid helium required for such trains is expensive and difficult to produce.

The same problem arises in high speed computers that could allow for processing 200x faster than current supercomputers. Another issue is that low temperatures required for superconductivity would mean that superconducting high speed computers could not be a household item.


-------------------

How are astronauts protected during re-entry? 3 marks
 
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Mr_Kap

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re: HSC Physics Marathon Archive

Good answer, you probably could have mentioned "electrons form cooper pairs as per BCS theory" in that bit at the beginning. Still would have given you 5/5 though.


How are astronauts protected during re-entry? 3 marks

During re-entry astronauts are subject to large amounts of g-force, which could potentially cause death in humans due to the high amounts of acceleration. Hence, to protect Austronauts from these g-forces, their vessel must enter the earth at the correct angle. This angle of inclination no shallower than 5.3 degrees, and no steeper than 7.7 degrees. Anything larger than 7.7 degrees would result in massive amounts of g-forces exceeding 9G (the approximate G-force humans can withstand), and the astronauts will be crushed and die. If the angle of re-entry is shallower than 5.3 degrees, then the astronauts safety is compromised as they will bounce off the atmosphere of the earth, causing it to launch back into space, and then say "BYE BYE Astronauts".

I know im missing something, and probably went the wrong way about this question but whatever.
--------------------------------------------------------------------------------------------------------------------------------------------
Describe how the AC Induction motor works. 3 Marks.
 
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astroman

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re: HSC Physics Marathon Archive

Guys what would be the best diagram to put in the HSC if they ask to draw and label JJ Thompson's cathode ray experiment?
 

Mr_Kap

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re: HSC Physics Marathon Archive

Guys what would be the best diagram to put in the HSC if they ask to draw and label JJ Thompson's cathode ray experiment?
Students Guide to HSC physics one....but add the circuits, and also show direction of both both mag field (with either a cross or a dot) and electric field.
 

astroman

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Students Guide to HSC physics one....but add the circuits, and also show direction of both both mag field (with either a cross or a dot) and electric field.
this one?
 
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astroman

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Guys can't visual, eclipsing, astrometric and spectroscopic binaries all be one or another? Since when they are approaching, each other, the telescope can see two of them, when they pass in front of another, they always eclipse, and they all red shift and blue shift...i'm confused.
 

Kaido

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Assess the impact of the use of transistors on society (5mks)
I can't find solid info on this, if someone can find/type up a coherent answer, I'd appreciate it
The sample answers just sounded like elaborate bs
 
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rand_althor

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re: HSC Physics Marathon Archive

Assess the impact of the use of transistors on society (5mks)
I can't find solid info on this, if someone can find/type up a coherent answer, I'd appreciate it
The sample answers just sounded like elaborate bs
Transistors have had mostly positive impacts on society.
Transistors are devices used for the amplification of signals in communication technologies. Before transistors, thermionic diodes were used to achieve this. There were many problems associated with the use of thermionic diodes however, including its large and fragile nature as a result of the vacuum created inside the glass covering, its unreliability, and the substantial heat released. Through the development of transistors, communication technology become more superior as it was now cheaper, smaller, and developed at a greater rate. This shows the positive impact on society.

The invention of the transistor through their use in microprocessors and microchips has also dramatically changed society. They have enabled the building of small, efficient computers that now have widespread applications throughout society as well as in scientific research. It has also allowed the automation of repetitive tasks which has led to higher quality of life. However, its negative impact can be seen from this, as many unskilled jobs performed by humans become redundant and this led to a rise in unemployment. In terms of communication, it has had a tremendous benefit enabling the internet which has drastically changed society for the better.

ASSESMENT: So overall transistors have had an extremely positive impact on society, largely seen through their use in microprocessors and microchips, cheaper communication technology, and the eventual construction of the internet as a result of these computers built using transistors. The only disadvantage is that it raised unemployment when transistors were first introduced into society, however the benefits greatly outweigh this disadvantage.
Probably a 3-4 to be honest, you shouldn't have all the description about the function at the start, it is useless for the question where you need to assess how it affects society, not why transistors are now used. That first sentence of your assessment should be the first sentence of your answer so you give a strong assessment first up, and then jump straight into advantages. You also need to be more indepth with advantages and disadvantages. When you say microprocessors and microchips, you need to then say that it is used in computers ( you didn't explicity say microchips are used in computers) and robotics which then allows for increased leisure through the automation of repetitive tasks (eg car manufacturing). Also, you need to say why microchips are an advantage, (they allow for the miniaturisation of circuits and faster processing).

Assess questions are like a mini essay, like the last short answer of paper 1. You need to convince the marker that you answering the question (assess) and provide a strong view. Use high modality language, no need to say 'mostly positive'. Just say extremely positive first up and then prove why that is so.

may seem harsh but I had to learn this the hard way lol, better to see this now than after the hsc I suppose
.
 

astroman

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re: HSC Physics Marathon Archive

In 1955, an early high-speed commercial computer weighed 3 tonnes, consumed 50 kilowatts of power, and cost $400,000. But it could perform 50 multiplications per second, a feat unmatchable by either a human or the latest adding machine. In 1977, a handheld calculator weighed under about 0.5 kg, consumed less than half a watt of power, could perform 250 multiplications per second, and cost $600. Today, you can buy palm-sized organizers for $250 that link to computers, transmit data, and store thousands of addresses, appointments, memos, lists, and e-mails. The keys to this stunning revolution in personal power are the transistor and the integrated circuit -- the centrepieces of the modern electronics systems that swept the world in the last half of the 20th century. Brilliant engineering and innovation lie behind these unseen elements that operate wireless communications, satellite broadcasts, air traffic control systems, microwave ovens, video cameras, touch-tone phones, computers, and many other products that have improved the quality, safety, and convenience of modern life.
The ancestor of these miniature electronic devices is the vacuum tube. Sealed inside a glass tube, a stream of electrons carried a current through a vacuum between electrodes. Vacuum tubes were crucial to the development of radio, television, and sound recording, and an essential component in early telephone equipment and computers. They were also fragile, bulky, and produced a considerable amount of waste heat. The first commercial computer, ENIAC, incorporated 18,000 vacuum tubes, weighed 30 tonnes, filled several large rooms, and consumed enough power to light 10 homes. Its cathode ray tubes required large amounts of heat in order to boil out electrons, needed time to warm up, and often burned out. A universal search to find a more compact and reliable device dominated engineering after World War II, and these efforts laid the groundwork for what followed.
What followed was the transistor, invented in 1947 by John Bardeen, Walter H. Brattain, and William B. Shockley, engineers and scientists at Bell Telephone Laboratories. The transistor's shape and size were strikingly different from the huge arrangement of the bulky vacuum tubes. A small metal cylinder about half an inch long contained two fine wires that ran down to a pinhead of solid semiconductive material soldered to a metal base. The current to the crystal on one wire controlled a larger current between the crystal and the second wire. It contained no vacuum, grid, plate, or glass envelope to keep the air away. It produced instantaneous action, with no need to warm up. The New York Times reported its debut with only slight interest. Little did anyone realize this tiny device would launch the "smaller, faster, more powerful" digital age.


By the early 1950s, the transistor had captured the world's imagination, first in the transistorised radio - the fastest selling retail object of the time. Early applications included telephone oscillators, hearing aids, automatic telephone routing devices, and other audio and communications devices. Computers were not yet considered a key application. IBM could not find anyone interested in selling transistors that were tailored to computers, so they contracted with Texas Instruments to develop transistors specifically designed for digital applications.
The transistor held great promise, but it would take several years before engineers worked out designs and manufacturing techniques. Semiconductor material was costly and required complex contacting methods. To help speed progress, Bell Labs licensed its transistor patent rights freely to other companies. The rapid advance made in transistor manufacturing from 1952 to 1960 has been attributed to this open sharing of technology, and the subsequent developments made at various industry and university laboratories and presented at open symposiums.
These advances undoubtedly led to Jack Kilby's invention of the integrated circuit (IC) at Texas Instruments in 1958. At the time, miniaturisation was driven by the Soviet's success with the Sputnik program, and was a major objective of government-funded electronics research programs. Kilby came up with the idea of organising numerous transistors and other electronic components on a silicon wafer, complete with wiring. It would take much ingenuity and effort, and the adaptation of techniques learned from earlier transistor fabrication, such as crystal growing.
Early transistors were made by hand. Eventually, sophisticated production techniques took hold. The real breakthrough in production was the use of oxide on silicon wafers, which allowed selective doping by diffusion of impurities through openings in the oxide. This process allowed contacts to the silicon to be made through other holes in the oxide. Photographic techniques were used to pattern the openings in the silicon oxide. With these techniques, hundreds of chips could be cut from a single slice of silicon and multiple transistors could be placed on each chip. Early chips were about three-quarters of a millimetre on a side. Today chips are several centimetres on a side, and can accommodate millions of transistors.
In the early 1950s, a transistor cost between $10 and $90 to make. As the semiconductor technology improved, the transistor became faster, cheaper, and more reliable. Now the transistors on a microchip cost less than a hundred-thousandth of a cent - so they are virtually free.




At first, integrated circuits were produced by the hundreds. Then engineers developed ways to add other components - resistors and capacitors -- to produce a microchip. As the technology developed, more and more components could be crammed into smaller and smaller dimensions. Gordon Moore, chairman of Intel, recognized a trend: the number of transistors per unit was doubling every year, and later, every 18 months. This insight became known as Moore's Law, one of the driving principles of the semiconductor industry, and Moore's vision helped Intel become one of the world's major corporations.
Part of the magic of electronics is adding millions of transistors to a tiny silicon chip. The rest of the magic is performed by engineers who determine their use through the development of microprocessors - the control centre embedded in refrigerators, automobiles, airplanes, computers, and thousands of other products.
Microchips took the transistor to an exciting new level. One microchip can operate an automobile's electrical system or launch an air force. It made thousands of new products possible, from heart pacemakers and hearing aids to efficient aircraft. Medical instruments, automobiles, cellular phones, CD players, and watches all operate because of microchips.
Until microprocessors appeared on the scene, computers were essentially discrete pieces of equipment used primarily for data processing and scientific calculations. From microprocessors engineers developed microcomputers -- systems about the size of a lunch box or smaller, but with enough computing power to perform many kinds of business, industrial, and scientific tasks.
The race continues to add more and more information on a microchip. By 2010, advanced microprocessors are expected to contain more than 800 million transistors. Where will microchips appear next? They might appear on the front of refrigerators to monitor food supplies and send grocery lists to the store, automatically charging credit cards or bank accounts. Or they could be implanted in children to prevent kidnapping, or inside the human brain to cure blindness or other medical conditions. The technology is limitless. Only imagination will govern its potential.

***

Heres a beast of an answer, its far too long and its probably crappy, but its a stab lol

-----------------------

The invention of the transistor paved the way for the development of miniature electronic circuits and profoundly integrated circuits (IC). Devices could now be made that required less space and less power which had far more reliability than existing devices. With the introduction of the transistor, electronic systems have continued to become smaller, more sophisticated and cheaper. It led to the so called computer revolution which has changed our lives greatly. Today, IC’s are used in a huge variety of microprocessor based equipment, ranging from mobile phones and calculators to ATM’s. The first microprocessors appeared in 1971 and have been reducing in size ever since.

Fast computers and tiny electronics have connected the world in an incredible amount of ways. For example, communication technologies have increased in efficiency and reliability, and are so advanced that through GPS, they are able to pin point any location on Earth to within a few metres. This has had a profound impact on missile and war technology, satellite technology and communication technology. It is now possible to speak and communicate with others all the way around the world, wirelessly and cheaply.

Computers no longer require a full cooling system and a store room full of computer circuits. They can now process huge volumes of information which has reduced repetitive manual labour. Transistors are particularly useful in memory chips. They control the flow of charges to a tiny capacitor. Other transistors act as amplifiers when information is retrieved.

In terms of environmental impact, there are positives and negatives. It has led to the development of solar cells in an attempt to battle scarce resources and reduce our dependence on fossil fuels. There is less pollution because transistors require less energy to run. Furthermore, there is no EMR produced from transistors. The main ingredient of semiconductors, silicon, is also an extremely abundant material.

On the other hand, while transistors are small in size, they have contributed to waste disposal problems. The process of producing transistors uses more toxic chemical and creates pollution, especially on non-degradable plastics which disturb the ecosystem when they are thrown away.

In summary:
- less air pollution
- increased globalisation
- creates new skills in terms of computer use
- rapid development in robotic technology
- miniaturised devices which were previously space intensive
- better medial diagnosis and treatment methods
- major companies and banks are advanced by microchips in their computers
- reduces labour and increases unemployment
- increases inequality of wealth between nations
- allows increased access to information for all
- increased individual satisfaction and entertainment
- Reduced social and ethical codes

Essentially impacts of the transistor have occurred in communication, technology, daily lives, and of course the environment. These impacts have on the whole been positive to society as they have greatly improved living standards and encouraged rapid growth in many areas of science.
***


***
 

Mr_Kap

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In 1955, an early high-speed commercial computer weighed 3 tonnes, consumed 50 kilowatts of power, and cost $400,000. But it could perform 50 multiplications per second, a feat unmatchable by either a human or the latest adding machine. In 1977, a handheld calculator weighed under about 0.5 kg, consumed less than half a watt of power, could perform 250 multiplications per second, and cost $600. Today, you can buy palm-sized organizers for $250 that link to computers, transmit data, and store thousands of addresses, appointments, memos, lists, and e-mails. The keys to this stunning revolution in personal power are the transistor and the integrated circuit -- the centrepieces of the modern electronics systems that swept the world in the last half of the 20th century. Brilliant engineering and innovation lie behind these unseen elements that operate wireless communications, satellite broadcasts, air traffic control systems, microwave ovens, video cameras, touch-tone phones, computers, and many other products that have improved the quality, safety, and convenience of modern life.
The ancestor of these miniature electronic devices is the vacuum tube. Sealed inside a glass tube, a stream of electrons carried a current through a vacuum between electrodes. Vacuum tubes were crucial to the development of radio, television, and sound recording, and an essential component in early telephone equipment and computers. They were also fragile, bulky, and produced a considerable amount of waste heat. The first commercial computer, ENIAC, incorporated 18,000 vacuum tubes, weighed 30 tonnes, filled several large rooms, and consumed enough power to light 10 homes. Its cathode ray tubes required large amounts of heat in order to boil out electrons, needed time to warm up, and often burned out. A universal search to find a more compact and reliable device dominated engineering after World War II, and these efforts laid the groundwork for what followed.
What followed was the transistor, invented in 1947 by John Bardeen, Walter H. Brattain, and William B. Shockley, engineers and scientists at Bell Telephone Laboratories. The transistor's shape and size were strikingly different from the huge arrangement of the bulky vacuum tubes. A small metal cylinder about half an inch long contained two fine wires that ran down to a pinhead of solid semiconductive material soldered to a metal base. The current to the crystal on one wire controlled a larger current between the crystal and the second wire. It contained no vacuum, grid, plate, or glass envelope to keep the air away. It produced instantaneous action, with no need to warm up. The New York Times reported its debut with only slight interest. Little did anyone realize this tiny device would launch the "smaller, faster, more powerful" digital age.


By the early 1950s, the transistor had captured the world's imagination, first in the transistorised radio - the fastest selling retail object of the time. Early applications included telephone oscillators, hearing aids, automatic telephone routing devices, and other audio and communications devices. Computers were not yet considered a key application. IBM could not find anyone interested in selling transistors that were tailored to computers, so they contracted with Texas Instruments to develop transistors specifically designed for digital applications.
The transistor held great promise, but it would take several years before engineers worked out designs and manufacturing techniques. Semiconductor material was costly and required complex contacting methods. To help speed progress, Bell Labs licensed its transistor patent rights freely to other companies. The rapid advance made in transistor manufacturing from 1952 to 1960 has been attributed to this open sharing of technology, and the subsequent developments made at various industry and university laboratories and presented at open symposiums.
These advances undoubtedly led to Jack Kilby's invention of the integrated circuit (IC) at Texas Instruments in 1958. At the time, miniaturisation was driven by the Soviet's success with the Sputnik program, and was a major objective of government-funded electronics research programs. Kilby came up with the idea of organising numerous transistors and other electronic components on a silicon wafer, complete with wiring. It would take much ingenuity and effort, and the adaptation of techniques learned from earlier transistor fabrication, such as crystal growing.
Early transistors were made by hand. Eventually, sophisticated production techniques took hold. The real breakthrough in production was the use of oxide on silicon wafers, which allowed selective doping by diffusion of impurities through openings in the oxide. This process allowed contacts to the silicon to be made through other holes in the oxide. Photographic techniques were used to pattern the openings in the silicon oxide. With these techniques, hundreds of chips could be cut from a single slice of silicon and multiple transistors could be placed on each chip. Early chips were about three-quarters of a millimetre on a side. Today chips are several centimetres on a side, and can accommodate millions of transistors.
In the early 1950s, a transistor cost between $10 and $90 to make. As the semiconductor technology improved, the transistor became faster, cheaper, and more reliable. Now the transistors on a microchip cost less than a hundred-thousandth of a cent - so they are virtually free.




At first, integrated circuits were produced by the hundreds. Then engineers developed ways to add other components - resistors and capacitors -- to produce a microchip. As the technology developed, more and more components could be crammed into smaller and smaller dimensions. Gordon Moore, chairman of Intel, recognized a trend: the number of transistors per unit was doubling every year, and later, every 18 months. This insight became known as Moore's Law, one of the driving principles of the semiconductor industry, and Moore's vision helped Intel become one of the world's major corporations.
Part of the magic of electronics is adding millions of transistors to a tiny silicon chip. The rest of the magic is performed by engineers who determine their use through the development of microprocessors - the control centre embedded in refrigerators, automobiles, airplanes, computers, and thousands of other products.
Microchips took the transistor to an exciting new level. One microchip can operate an automobile's electrical system or launch an air force. It made thousands of new products possible, from heart pacemakers and hearing aids to efficient aircraft. Medical instruments, automobiles, cellular phones, CD players, and watches all operate because of microchips.
Until microprocessors appeared on the scene, computers were essentially discrete pieces of equipment used primarily for data processing and scientific calculations. From microprocessors engineers developed microcomputers -- systems about the size of a lunch box or smaller, but with enough computing power to perform many kinds of business, industrial, and scientific tasks.
The race continues to add more and more information on a microchip. By 2010, advanced microprocessors are expected to contain more than 800 million transistors. Where will microchips appear next? They might appear on the front of refrigerators to monitor food supplies and send grocery lists to the store, automatically charging credit cards or bank accounts. Or they could be implanted in children to prevent kidnapping, or inside the human brain to cure blindness or other medical conditions. The technology is limitless. Only imagination will govern its potential.

***



***


***
Much information.

Brain Overload ---> :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz: :spzz:
 

Mr_Kap

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re: HSC Physics Marathon Archive

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Describe how the AC Induction motor works. 3 Marks.
?
 

Crisium

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re: HSC Physics Marathon Archive

Guys what would be the best diagram to put in the HSC if they ask to draw and label JJ Thompson's cathode ray experiment?
Make sure it has

* A bulbous end with a deflection scale

* Vertical deflection plates within the evacuated tube (electric field)

* Helmholtz coils outside the evacuated tube (magnetic field)

* Cathode

* Collimated Anode
 
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