Ratio kinetic energy of alpha particle / kinetic energy of proton

  • Thread starter 385sk117
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  • #1
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Homework Statement


A photon and alpha particle are accelerated from rest through the same potential difference.
After acceleration what is the ratio kinetic energy of alpha particle / kinetic energy of proton?


Homework Equations


I guess I have to use eV = 1/2mv^2


The Attempt at a Solution


I dont know what value have to be used in place of e in equation eV = 1/2mv^2
the mass of alpha particle is approximately 4 times of photon and that's all i know
I guessed the answer as 4 but the answer was 2
I think there is something to do with the velocity of alpha particle and photon but i'm stucked can not think of anything..
 

Answers and Replies

  • #2
209
1
An alfa particle has two protons, so that's twice the charge of one proton.
 
  • #3
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Thanks a lot! So i didnt have to know the exact charges but the ratio
 

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