The classical theory of physics predicts that the shorter than wavelength of EMR absorbed, the more intense the radiation released. However this meant that it would violate the conservation of energy as the area under a black body curve would be infinite. The black body that was produced with experimental data showed that the curve peaked at UV instead of going off to infinity at short wavelengths, as classical physics predicted. The experimental black body curve could not be produced with classical physics mathematics.
Wasn't my question so I can't decide as to if it's a 6/6 but it seems 5 marks are definitely there.
The Braggs shone a beam of X-rays at a crystal surface, which produced a diffraction pattern on a detector. When the angle of incidence was altered, the changes in the diffraction pattern allowed the Braggs to mathematically determine the spacing between successive planes of ions in the crystal structure, which in turn allowed them to determine the overall crystal structure of the substance.
I think you forgot the fact that he said EMR exsists in packets where the energy of each packet is defined by e=hf, he also hypothesised that there is more low energy (low frequency) packets than High energy/frequency packets. Moverover, high frequency packets need more energy to activate, low need less energy to activate. So thats how he explained the experimental reults
I think you should mention where a non-inertial frame of reference applies in this.
you forgot the formula they deduced: 2dsin(theta)= n(wavelength lima) where if n=1,2,3 it underwent constructive inter and if n=1/2, 3/2... then it underwent destructive interference.
You should mention that the beams fired at the nickel crystal were monochromatic (in faze), and the x-rays were used as they were similar to the spacing between the nickel atoms which is deal for diffraction. I guess you could also draw a diagram the fully shows how he worked out the spacing's between atoms, if this was in an exam situation
E=hf is more just showing how all energy emitted and absorbed by the black body is quantised which is the explanation to why it doesn't follow classical theory i.e. its saying that intensity is not proportional to frequency
Explaining the shape itself is far beyond the requirements of the syllabus - the dot point asks you to identify planck's quantisation
I think he suggested that the energy was found by integrating with boxes or someshit like that and he was able to calculate this becaused he assumed that light was quantised..
U can with Uni Maths... But MAths in physics is like year 7 maths... There is quite a difference there
I talked about this in an exam once for Physics and my teacher said that it was mainly unnecessary, especially when the question is only worth 3 marks. However, you do raise a good point, and personally I reckon it'd be useful to mention the 2dsintheta stuff in an exam, especially if it's worth more than 3 marks
The answer to your question is here: http://disciplinas.stoa.usp.br/pluginfile.php/48089/course/section/16461/qsp_chapter10-plank.pdf