In gamma ray emission form a nucleus (A) there is no change in the proton-number and neutron number (B) Both the number are changes (C) only Proton number change (D) only neutron number change

Gamma-ray emission occurs when a nucleus in an excited state (i.e., with excess energy) transitions to a lower energy state by emitting a high-energy photon known as a gamma-ray. This process does not involve the change of any particles within the nucleus.

Now, let's analyze each option and determine which one is correct based on our understanding of gamma-ray emissions. (A) No change in the proton-number and neutron number. This statement aligns with our understanding that gamma-ray emission does not involve any changes in the composition of the nucleus. (B) Both proton and neutron numbers change. This statement contradicts our understanding of gamma-ray emissions as they do not involve changes in the composition of the nucleus. (C) Only Proton number change. This statement is also inconsistent with our understanding of gamma-ray emission, as it does not involve any changes in the composition of the nucleus. (D) Only neutron number change. This statement, like the others, contradicts our understanding of gamma-ray emission, as it does not involve any changes in the composition of the nucleus.

Based on our analysis and understanding of gamma-ray emissions, we can conclude that the correct answer is: (A) There is no change in the proton-number and neutron number during gamma-ray emission from a nucleus.