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: Speed of particles

  1. May 17, 2009 #1
    1. The problem statement, all variables and given/known data
    The problem is at
    http://dl.getdropbox.com/u/175564/physicsSpeedParticles.JPG [Broken]

    2. Relevant equations
    The following equations may be useful
    E = .5 mc^2
    E = Bev

    3. The attempt at a solution

    The right answer is (a).
    However, I am unsure how it is obtained.

    For example, by comparing the energies of the two particles, we get only
    (v1 / v2)^2 = (E1 / E2) * 2/167

    where the energies are unknown.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. May 17, 2009 #2


    User Avatar
    Homework Helper

    Consider the conservation of linear momentum.
  4. May 17, 2009 #3
    I get the following equation
    v1 / v2 = (p1 / p2) * (234 / 4)

    I assume that the momentum of the alpha particle equals that of the original particle.

    This gives us the right answer

    v1 / v2 = (234 / 4)
    = 58.5

    Thank you for your answer!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook