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Assertion: A free neutron is not a stable particle.
Reason: It decay spontaneously into a proton, an electron and an antineutrino.
(a)If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
(b)If both Assertion and Reason are true but Reason is not explanation of the Assertion.
(c)If Assertion is true but the Reason is false.
(d)If Assertion is false but Reason is true.

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Important Questions on Atomic Nucleus
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Carbon decays to boron according to the following formula: .
Assume that positrons produced in the decay combines with free electrons in the atmosphere and annihilate each other almost immediately. Also, assume that the neutrinos are massless and do not interact with the environment. At , we have of . If the half-life of the decay process is , the net energy produced between time, and will be nearly,

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