Question

A moving positron and electron both
with kinetic energy
1 MeV annihilate with each other
and emits two gamma photons. If
the rest mass energy of an electron
is 0.51 MeV, the wavelength of
each photon is ?
A 5.1 x 10-3Å
B10.2 x 10-38
C8.2 x 10-3 Å(Correct Answer)
D6.2 x 10-3Å​

Answer 1

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