To calculate energy of gamma ray photon,
we know the energy equation, E= hf
where,
h = planck's constant
f = frequency
we know the value of, h = 6.62607004 Ă— 10^-34 m2 kg / s
f = 5.02*10^20 Hz
Hence,
E = 6.62607004 Ă— 10^-34 x 5.02*10^20
= 33.2 x 10^-14 Joules