Question

An electron and a positron at rest annihilate each other and a single y ray photor emitted. The wavelength of y-ray is
(A) 1.244°
(B) 0.0124°
(c) 12400.4°
(D) None
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Answer 1

Answer:

cannot decay into a photon plus a recoilingelectron because the latter alone would require an energy greater than mc2.) ... But the final momentum cannot be zero, since photons always travel at the speed of light; an electron-positron pair can annihilate to make two photons, but not one.

Explanation:

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