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Q.

If the rest mass of electron or positron is 0.51 MeV, then the kinetic energy of each particle in the electron-positron pair production by a -photon of 2.42 MeV will be 

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a

1.9 MeV   

b

0.7 MeV 

c

0.3 MeV 

d

1.5 MeV  

answer is C.

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Detailed Solution

Mass produced (0.51 + 0.51) MeV=1.02MeV.
Remaining energy
(2.42 – 1.02) = 1.4 MeV 

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