Concept:Gamma rays are high-energy electromagnetic waves emitted when atomic nuclei undergo internal changes.
Explanation:Gamma rays are produced during nuclear processes such as radioactive decay or nuclear transitions.
When a nucleus is left in an excited, higher-energy state, it releases the extra energy as gamma radiation.
This often accompanies alpha or beta decay because the daughter nucleus may remain excited.
Fast electrons stopped by metals produce X-rays, not gamma rays.
Energy changes within the electronic structure of atoms produce visible or ultraviolet light.
Deflecting electrons in magnetic fields does not directly produce gamma rays.
Thus, gamma rays come from energy changes inside the nucleus of an atom.
Answer:Option B — energy changes occur within the nuclei of atoms.