bothe and becker (2 Viewers)

[Jocharles]

Do we need to know about bothe and becker and their experiments of bombarding beryllium with Alpha Particles , or can we skip straight to Chadwick and his experimentation with alpha particles leading to the confirmation of the neutron?

 

[blabla91]

you need to know about as much as you have written in this post, bothe and becker conducted experiments where alpha particles were fired at beryllium which then produced this new penetrating 'radiation' You could then add that Curie and Joliet discovered that this radiation could knock protons from parrafin wax and then chadwick used conservation of energy and momentum laws to deduce the properties of the neturon

you probably dont even have to mention them its just a bit of a back story but as long as you can describe the experiment itself that chadwick used.

 

[Jocharles]

you need to know about as much as you have written in this post, bothe and becker conducted experiments where alpha particles were fired at beryllium which then produced this new penetrating 'radiation' You could then add that Curie and Joliet discovered that this radiation could knock protons from parrafin wax and then chadwick used conservation of energy and momentum laws to deduce the properties of the neturon

you probably dont even have to mention them its just a bit of a back story but as long as you can describe the experiment itself that chadwick used.

cheers.

 

[Aerath]

Yeah, the main focus is Chadwick. Though, if this was part of a 7 mark question, I probably would mention Bothe and Becker (as well as Joliot and Curie).

 

[annabackwards]

Yeah, just mention Bothe and Becker.

But if it was a 7 marker, I was just wondering, would we have to be specific about how he utilised the law of conservation of momentum and energy? I know we have to say he used them, but do we have to say exactly how?

 

[Aerath]

Yeah, just mention Bothe and Becker.

But if it was a 7 marker, I was just wondering, would we have to be specific about how he utilised the law of conservation of momentum and energy? I know we have to say he used them, but do we have to say exactly how?

Hmmm, you mean sorta by contradiction? If the unknown radiation was gamma rays, it would've contravened LOCOE, hence, must have been something somewhat similar is mass to the proton, in order to conserve LOCOM? =P

 

[annabackwards]

Hmmm, you mean sorta by contradiction? If the unknown radiation was gamma rays, it would've contravened LOCOE, hence, must have been something somewhat similar is mass to the proton, in order to conserve LOCOM? =P

Yeha, that stuff. Do we need to put it in because study guides like excel say that it couldn't be gamma rays but do not say why, but my teacher says you have to mention that it was because of LOCOE that it couldn't be gamma rays. Am i right in assuming i should listen to my teacher? By the way, only asking because he's from Melbourne and never has taught in NSW lol.

 

[boxhunter91]

anna you do need to use law of conservation of mass energy and momentum.
Like he was able to determine the new particle via the reaction
ie. 9/4 Be + 4/2 He --> X + 12/6 C
X using law of conservation of mass is 1/0n.
.: determined the existence of this new particle...
The Law of Conservation of Energy:
Chadwick was able to make the conclusion the the unknown radiation wasn't gamma rays but instead a neutral particle as the gamma radiation photons would not have enough momentum to eject the photons with momentum and energy that was observed.

Hope this helps..

 

[Aerath]

Well, it helped me a lot.

 

[boxhunter91]

thats my deed for the day lol.

 

[Aerath]

Just a question - how did he detect that it was Carbon that was produced as a result o the alpha particle colliding with the beryllium?

 

[boxhunter91]

I actually am not to sure :S
The experiment was Alpha particles being emitted to Beryllium producing an unknown form of radiation and id assume 12/6 Carbon.
This unknown radiation was then fired at parrafin wax emitting protons then he measured the speed and energy of the protons.
No where does it say Carbon is produced..
I dont think it is necessary.

 

[tonyharrison]

The quanta to quarks topic kills me.
It's like..we'll tell you a tiny bit about this, just so it confuses you.

For example, spin.

My textbook had like the tiniest box on it...arghh...

 

[boxhunter91]

Actually q2q i find is the easiest topic. Past papers are really straight forward for it as well as Chem and Bio in options.

 

[tonyharrison]

Well we can't ALLL be geniuses <_<

 

[boxhunter91]

Trust me i aint a genius.

 

[tonyharrison]

anna you do need to use law of conservation of mass energy and momentum.
Like he was able to determine the new particle via the reaction
ie. 9/4 Be + 4/2 He --> X + 12/6 C
X using law of conservation of mass is 1/0n.
.: determined the existence of this new particle...
The Law of Conservation of Energy:
Chadwick was able to make the conclusion the the unknown radiation wasn't gamma rays but instead a neutral particle as the gamma radiation photons would not have enough momentum to eject the photons with momentum and energy that was observed.

Hope this helps..

Oh sorry...my mistake...

Just joking around btw

 

[Fortify]

Actually q2q i find is the easiest topic. Past papers are really straight forward for it as well as Chem and Bio in options.

I gotta agree, just memorise loads of info and you're dead set @_@

 

[Aerath]

The quanta to quarks topic kills me.
It's like..we'll tell you a tiny bit about this, just so it confuses you.

For example, spin.

My textbook had like the tiniest box on it...arghh...

What do you mean spin? There's not much to know about it, it's the 4th quantum number, Pauli discovered it, and it gave rise to the PEP.

 

[tonyharrison]

*feels stupid*