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!

Homework Help: Reaction between photon and proton !

  1. Sep 24, 2013 #1
    A high energy proton can collide with a photon to produce a charged pion and a neutron. If the photon comes from the cosmic microwave background and has an energy equivalent to a temperature of 3 K, what is the minimum energy of the proton in eV necessary to allow this reaction?

    I'm thinking about momentum of a photon and stuff.. is my approach correct ? if not what should be done ?
  2. jcsd
  3. Sep 30, 2013 #2
    So the reaction is:
    [tex]p^+ + ph \rightarrow pion + n^0[/tex]

    The energy of the left handside must not be less, than that of the right handside, so you'll just have to look up the energies of the neutron and pion (zero velocity).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted