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A free neutron decays into a proton, an ...

A free neutron decays into a proton, an electron and

A

A neutrino

B

An antineutrino

C

An alpha particle

D

A beta particle

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The correct Answer is:
B
(b) `._0 n^1 = ._1 p^1 + ._(-1) e^0 + overline v`
Antineutrino is required for conservation of spin.
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