Atoms And Nuclei Question 203

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 K.E. of the electron- positron pair is 0.78 MeV, then the energy of the gamma ray photon must be [MP PMT 1991]

Options:

A) 0.78 MeV

B) 1.78 MeV

C) 1.28 MeV

D) 0.28 MeV

Show Answer

Answer:

Correct Answer: B

Solution:

Energy of g-ray photon = $ 0.5+0.5+0.78=1.78\ MeV $ .



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