Which statement correctly defines radiation?

• A. A type of chemical hazard
• B. A measure of heat
• C. The emission of energy in the form of waves or particles through space or any material
• D. A form of information

Answer: (C)

Radiation is the emission and propagation of energy through space or through matter in the form of waves or particles. This means energy can travel as electromagnetic waves like light, radio waves, or X-rays, or as particles such as alpha or beta radiation, moving away from a source without needing physical contact. It’s not simply a chemical hazard, a measure of heat, or a form of information. While some radiative processes can transfer heat, the essential idea is energy traveling through space or material as waves or particles, not the specific hazards, temperature units, or data-carrying notions in the other statements.