Question

A gamma ray photon creates an electron-positron pair. If
the rest mass energy of an electron is 0.5 MeV and the total
kinetic energy of the electron-positron pair is 0.78 MeV,
then the energy of the gamma ray photon must be
(a) 0.78 MeV (b) 1.78 MeV
(c) 1.28 MeV (d) 0.28 MeV

Answer 1

Answer:

a is the correct answer this question

Answer 2

Answer:

TOTAL ENERGY BY THE GAMMA RAY PHOTON:

[tex]\implies 0.5 MeV + 0.78MeV[tex]

[tex]\implies 1.28 MeV[tex]

BECAUSE IT THE SECOND ELECTRON IN THE PAIR OF FIRST ELECTRON . SO , IT WILL BE IN SUM