Consider a sample of a pure beta-active material (A) All the beta p...

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Consider a sample of a pure beta-active material
(A) All the beta particles emitted have the same energy
(B) The beta particles originally exist inside the nucleus and are ejected at the time of beta decay
(C) The antineutrino emitted in a beta decay has zero rest mass and hence zero momentum.
(D) The active nucleus changes to one of its isobars after the beta decay
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