Consider a process in which two gamma-ray photons are released when an electron and a positron are annihilated. [note that the mass of a positron is equal to that of an electron, and the gamma-ray photon has no mass.]
(a) what is the final energy of each photon (in j units)?
(b) what is the final energy of each photon (in kj/mol units)?
(c) what is the final energy of each photon (in ev units)?

Explanation:

This question involves the conversion of mass into energy: E = mc².

e + p ⟶ γ + γ

Each particle has the same mass so, in terms of mass, we can write

2e ⟶ 2γ or

 e ⟶ γ

Thus, we can just convert the mass of an electron to its energy equivalent.

(a) Energy in joules

(b) Energy in kilojoules per mole

(c) Energy in electron volts

explanation:

i think option no d is the correct answer

i think it's letter a.