ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: wilfred on October 09, 2009, 07:04:54 pm
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This is probs just a simple question but i am stuck
It shows two pictures of diffraction patterns one is a monochromatic X-ray and the other is electrons, these are shot though aluminium foil to create essentially the same pattern.
The X-ray has an energy of 2.28x10^-16 J and momentum of 7.94x10^-25
Does the X-ray have the same energy or momentum as the electrons? explain your choice
So my question is can it not be both because energy for both is calculated by E=hc/(wavelength) and momentum of both is p=h/(wavelength) and since they both have the same wavelength the will have the same momentum and energy?
thanks
-
This is probs just a simple question but i am stuck
It shows two pictures of diffraction patterns one is a monochromatic X-ray and the other is electrons, these are shot though aluminium foil to create essentially the same pattern.
The X-ray has an energy of 2.28x10^-16 J and momentum of 7.94x10^-25
Does the X-ray have the same energy or momentum as the electrons? explain your choice
So my question is can it not be both because energy for both is calculated by E=hc/(wavelength) and momentum of both is p=h/(wavelength) and since they both have the same wavelength the will have the same momentum and energy?
thanks
No,
You cannot use E=hc/(wavelength) to calculate the energy for electrons. This formula is only for light!
They will have the same momentum but not the same energy.