The high-energy electromagnetic radiation emitted from the nucleus is called?

• A. Alpha radiation
• B. Beta radiation
• C. Gamma radiation
• D. X-ray radiation

Answer: (C)

The key idea is that nuclei can shed energy as electromagnetic radiation, and the specific high-energy photons emitted directly from the nucleus are gamma rays. Gamma radiation arises when a nucleus relaxes from an excited state to a lower energy level (often after another decay step), producing a photon with very high energy. This distinguishes gamma rays from alpha radiation, which consists of helium nuclei, and beta radiation, which is made of charged particles (electrons or positrons). X-ray radiation is also electromagnetic, but it typically originates from electronic processes outside the nucleus (such as transitions in atoms or deceleration of charged particles), not from nuclear de-excitation. Gamma rays are characteristic of nuclear transitions: they are photons with no charge, very short wavelengths, and high penetrating power.