In gamma ray emission from a nucleus-Both- the neutron number and the proton number change-Only the neutron number changes-There is no change in the proton number and the neutron number-Only the proton number changes-

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Gamma rays are typically emitted by the daughter nuclei produced as a result of alpha and-or beta decay of parent nuclei- The daughter nuclei produced from alpha and-or beta decay are generally excited -high energy state- and emit a gamma ray photon to come back to stable energy state- Therefore- in gamma decay- there is no change in neutron and proton number -because these particles do not undergo any reaction in the process-

In gamma ray emission from a nucleus:Both, the neutron number and the proton number change.Only the neutron number changes.There is no change in the proton number and the neutron number.Only the proton number changes.

In gamma ray emission from a nucleus:
Both, the neutron number and the proton number change.
Only the neutron number changes.
There is no change in the proton number and the neutron number.
Only the proton number changes.