Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Who's up for a challenge? Quantum Que

  1. Apr 8, 2008 #1
    1. The problem statement, all variables and given/known data
    An incident x-ray has a wavelength of 0.525nm and scatters as 112 degrees above the incidental x-axis in the positive x-direction. Find the direction of propagation of the electron that the incidental wavelength hits. (the answer is to be 34 degrees below the x-axis)

    2. Relevant equations
    Using Compton's Effect
    [tex]\frac{h}{\lambda_{1}}[/tex]=[tex]\frac{h}{\lambda_{2}}[/tex] cos[tex]\theta[/tex]+pecos[tex]\phi[/tex]

    0=[tex]\frac{h}{\lambda_{2}}[/tex] sin[tex]\theta[/tex]+pesin[tex]\phi[/tex]

    where [tex]\phi[/tex] = angle of electron direction
    [tex]\theta[/tex]= angle of x-ray direction
    pe=momentum of electron

    3. The attempt at a solution
    Since the electron momentum is not given, numbers can't be plugged in to find the angle.
    Possibly the two equations have to be manipulated together (ie add/subtract) somehow?
    Or using energy equations?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted