In gamma ray emission from a nucleus (a) only the proton number changes (b) both the neutron number and the proton number change (c) there is no change in the proton number and the neutron number (d) only the neutron number changes

Answer: (c). A γ -ray is a photon emitted when an excited nucleus drops to a lower energy level. It carries no charge and no mass number, so Z and N both stay the same. So the answer is (c).

In gamma ray emission from a nucleus | JEE Main 2007 (AIEEE)

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Radioactive Decays: Alpha, Beta, Gamma

In gamma ray emission from a nucleus

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Answer: (c)

A $\gamma$ -ray is a photon emitted when an excited nucleus drops to a lower energy level.
It carries no charge and no mass number, so $Z$ and $N$ both stay the same.
So the answer is (c).

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