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Ratio kinetic energy of alpha particle / kinetic energy of proton 
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#1
Apr2109, 02:17 PM

P: 50

1. The problem statement, all variables and given/known data
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? 2. Relevant equations I guess I have to use eV = 1/2mv^2 3. 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.. 


#2
Apr2109, 02:24 PM

P: 211

An alfa particle has two protons, so that's twice the charge of one proton.



#3
Apr2109, 11:24 PM

P: 50

Thanks a lot! So i didnt have to know the exact charges but the ratio



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