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Speed of particles

  • Thread starter soopo
  • Start date
  • #1
225
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Homework Statement


The problem is at
http://dl.getdropbox.com/u/175564/physicsSpeedParticles.JPG [Broken]


Homework Equations


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

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:

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5
Consider the conservation of linear momentum.
 
  • #3
225
0
Consider the conservation of linear momentum.
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!
 

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