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A gamma ray photon creates an electron-p...

A gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is `0.5 MeV` and the total `K.E.` of the electron-position pair is `0.78 MeV`, then the energy of the gamma ray photon must be.

A

`0.28MeV`

B

`0.78MeV`

C

`1.28MeV`

D

`1.78MeV`

Text Solution

Verified by Experts

The correct Answer is:
D
`gamma rarr e^(+) +e^(-)`
Energy of photon `= 2xx0.51 + 0.78 = 1.78MeV`
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