What are radiation and examples?

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Detailed Solution

Radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. Examples include electromagnetic radiation (light, X-rays), heat radiation (infrared), radioactive decay (alpha, beta, gamma particles).

Definition: Radiation refers broadly to energy travelling away from a source. It can be in many forms: electromagnetic (photons), particle (nuclei, electrons), acoustic (sound) in some definitions. In physics and engineering the term often means electromagnetic or particle radiation.
Examples:
- Sunlight (visible light) – electromagnetic radiation.
- Infrared heat radiating from a heater – thermal radiation.
- X-rays and gamma rays – high-energy electromagnetic radiation.
- Alpha particles, beta particles emitted from radioactive nuclei – particle radiation.
Radiation can pass through space (vacuum) without needing a medium (for electromagnetic radiation). It can be ionising (dangerous) or non-ionising depending on energy.

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