Nuclei - Result Question 88
90. A free neutron decays into a proton, an electron and
[1997]
(a) a beta particle
(c) an anti-neutrino
(b) an alpha particle
(d) a neutrino
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Answer:
Correct Answer: 90. (c)
Solution:
- (c) $ _0 n^{1} \longrightarrow _1 p^{1}+ _{-1} e^{0}+X$
$X$ must have zero charge and almost zero mass as electron is emitted. Hence $X$ must be anti-neutrino.
