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Question

According to Einstein's theory of relativity, mass can be converted into energy and vice-versa. The lightest elementary particles, taken to be the electron, has a mass equivalent to 0.51 MeV of energy. Then we can say that

A
The minimum amount of energy available through conversion of mass into energy is 1.02 MeV
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B
The least energy of a γray photon that can be converted into mass is 1.02 MeV
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C
Whereas the minimum energy released by conversion of mass into energy is 1.02 MeV, it is only a γray photon of energy 0.51 MeV and above that can be converted into mass
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D
Whereas the minimum energy released by conversion of mass into energy is 0.51 MeV, it is only a γray photon of energy 1.02 MeV and above that can be converted into mass
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Solution

The correct options are
A The minimum amount of energy available through conversion of mass into energy is 1.02 MeV
B The least energy of a γray photon that can be converted into mass is 1.02 MeV
We always have either an electron-positron pair production or an electron-positron pair annihilation, so that the total charge remains zero.
Hence, the least energy through conversion of mass into energy or through conversion of energy into mass is 1.02 MeV.

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