Question

A positron with kinetic energy 1 MeV and an electron with kinetic energy 1MeV meet each other moving in opposite directions. They annihilate each other by emitting two photons. If the rest mass energy of an electron is 0.51 MeV, the wavelength of each photon is(explanation must)

A) 5.1×10−3A0
B) 10.2×10−3A0
C) 8.2×10−3A0
D) 6.2×10−3A0

Answer 1

Answer:

MeV positron and a 1 MeV electron meet each moving in opposite directions. They annihilate each other by emitting two photons. If the rest mass energy of an electron is 0.51 MeV, the wavelength of each photon