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 $


जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक