In $\beta$ decay it is found that both the direction of the ejected electron (with respect to the recoil direction of the parent nucleus) and the magnitude of the electron's velocity are variable. From these facts, we can infer that another particle (the neutrino, as it turns out) is needed to preserve the conservation of
A) energy.
B) momentum.
C) all of the above.
D) none of the above.

Question

Quizplus · Accepted Answer

The variability in both the direction and magnitude of the ejected electron's velocity in $\beta$ decay indicates that another particle is involved to ensure the conservation of both energy and momentum. The neutrino is this particle, which carries away the necessary energy and momentum to satisfy these conservation laws.

In β\betaβ Decay It Is Found That Both the Direction of the of the Ejected

In $\beta$ Decay It Is Found That Both the Direction of the of the Ejected