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Originally the radioactive beta decay wa...

Originally the radioactive beta decay was thought as a decay of a nucleus with the emission of electrons only (Case I). However, in addition to the electron, another (nearly) massless and electrically neutral particle is also emitted (Case II). Based on the figure below, which of the following is correct:

A

(a) in both cases I and II

B

(a) in case I and (b) in case II

C

(a) in case II and (b) in case I

D

(b) in both cases I and II

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