Consider a sample of a pure beta-active material

Options

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 the 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

Answer

D

Explanation

(A) The emitted `beta`-particles may have varying energy.
(B) `e^(-)` or `e^(+)` does not exists inside the nucleus.
(C ) `overset(-)v` does carry momentum.
(D) In `beta`-decay mass number does not change.