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A free neutron decays spontaneously into

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a proton, an electron and an anti neutrino

a proton, an electron and a neutrino

a proton and electron

a proton, an electron, a neutrino and an anti neutrino

answer is A.

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Detailed Solution

Neutron is unstable outside the nucleus. It decays into a proton, an electron and an anti neutrino according to the following equation

${}_{0}^{1}n \to \to {}_{1}^{1}H + {}_{- 1}^{0}e + \bar{ν}$

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