Atoms And Nuclei Question 344
Question: A gamma ray 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 must be
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 y-ray photon = Restmass energy+ K.E. $ =2,(0.5)+0.78=1.78,MeV $
