JEE Main · 2007 · 29 Apr 2007 · Offline · Modern Physics

In gamma ray emission from a nucleus

(A)both the neutron number and the proton number change
(B)there is no change in the proton number and the neutron number✓ Correct
(C)only the neutron number changes
(D)only the proton number changes

Answer: (B)

Solution

Gamma emission is a transition between energy levels of one and the same nucleus, which simply sheds surplus energy as a photon. No nucleon is created or destroyed in the process, so both the proton number and the neutron number are left exactly as they were.

JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option

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