1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Compton scattering and the energies of incident and scattered photons ?

  1. Nov 15, 2008 #1
    Compton scattering and the energies of incident and scattered photons...???

    Hey guys! I'm alittle stuck...Hope you can shed light on this for me!
    The question is: 'In a head-on compton encounter, the total energy (i.e the rest mass plus the kinetic energy) of the scattered electron is 10.22MeV. The rest mass energy of the electron is 0.511MeV.
    (a) Apply the laws of conservation of energy and momentum to the encounter and thus find the energies, in eV, of the incident and scattered photons.
    (b) Show that the change in wavelength is d(lambda)=(2h)/(m(electron)*C)


    2. Relevant equations

    The equations I was thinking of using were:

    For energy: (hc/lamda) + (m(electron)*c^2) = (hc/lambda2) + Y(m(electron)*c^2)

    For momentum: (h/lambda) + 0 = Y(m(electron)*v) - (h/lambda2)

    Where Y = the lorentz factor = (1-(v/c))^-1/2


    3. The attempt at a solution

    I was thinking of combining the above equations and rearranging the lorentz factor to find the speed, but don't know where to start to be honest. Every equation involving the compton scattering involves an angle, so since i don't have an angle to play with, i have no idea where to start!
     
  2. jcsd
  3. Nov 16, 2008 #2

    malawi_glenn

    User Avatar
    Science Advisor
    Homework Helper

    Re: Compton scattering and the energies of incident and scattered photons...???

    Do it with vectors.

    Draw the situation in the xy-plane. And use the relation for energy and momentum for the electron. Also you need to know some vector algebra, dot-product. hint: cut the lorentz factor, you dont need it here - just vectors, and energy - momentum relation.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Compton scattering and the energies of incident and scattered photons ?
Loading...