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: Find the speed of an electron given momentum

  1. Aug 7, 2010 #1
    1. The problem statement, all variables and given/known data
    An electron has momentum of magnitude 2.74 10-22 kg · m/s. What is the electron's speed?
    2. Relevant equations
    p=ymv, where y=gamma

    3. The attempt at a solution
    v=p/m, which is wrong. Any suggestions?
  2. jcsd
  3. Aug 7, 2010 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    If p = γmv, then v = p/γm not p/m. Of course, γ itself is a function of v, so you need to write it out and then solve for v correctly.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook