1. Limited time only! Sign up for a free 30min personal 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!

Photon and free electron

  1. Apr 1, 2009 #1
    Why is it that a photon can't transfer all its energy to a free electron?
  2. jcsd
  3. Apr 1, 2009 #2


    User Avatar

    Staff: Mentor

    It's imposible to conserve both energy and momentum in such a process. You need another particle or object in order to do this.
  4. Apr 1, 2009 #3
    It's not the same thing, but there is a classical analogue of that fact: a ball of mass m cannot transfer all its kinetic energy to a ball of mass M=/=m.
  5. Apr 1, 2009 #4
    The only way for a photon to interact with a free electron (other than photoproduction at very high energies) is via Compton scattering.
  6. Apr 1, 2009 #5
    Last edited by a moderator: Apr 24, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Photon and free electron
  1. Free electrons (Replies: 2)

  2. Free electrons (Replies: 5)