EVERYDAY SCIENCE

Detailed explanation-1: --rays are electromagnetic waves. It travels at the speed of light.

Detailed explanation-2: -Alpha, Beta, Gamma in ascending order. Alpha particles leaves the nucleus of an unstable atom at a speed of 16, 000 kilometres per second, around a tenth the speed of light. Beta particles travel at a speed of 270, 000 kilometres per second, around 98% of speed of light. Gamma particles travel at the speed of light.

Detailed explanation-3: -Alpha–Unstable nuclei frequently emit alpha particles, actually helium nuclei consisting of two protons and two neutrons. By far the most massive of the decay particles, it is also the slowest, rarely exceeding one-tenth the velocity of light.

Detailed explanation-4: -Alpha particles are the most harmful internal hazard as compared with gamma rays and beta particles. Radioactive materials that emit alpha and beta particles are most harmful when swallowed, inhaled, absorbed, or injected. Gamma rays are the most harmful external hazard.