# Radiation |  | In physics, **Radiation** is the emission or transmission of energy in the form of waves or particles through space or a material medium. This includes:electromagnetic radiation consists of photons, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ) particle radiation consists of particles of non-zero rest energy, such as alpha radiation (α), beta radiation (β), proton radiation and neutron radiation acoustic radiation, such as ultrasound, sound, and seismic waves, dependent on a physical transmission medium gravitational radiation, in the form of gravitational waves, ripples in spacetime | |-|-| | | wikipedia:: [Radiation](https://en.wikipedia.org/wiki/Radiation) | ## Types - [[Electromagnetic radiation]] - [[Particle radiation]] consists of particles of non-zero rest energy, such as alpha radiation (α), beta radiation (β), proton radiation and neutron radiation - [[Acoustic radiation]], such as ultrasound, sound, and seismic waves, dependent on a physical transmission medium - [[Gravitational radiation]], in the form of gravitational waves, ripples in spacetime ## Inbox - [[Radioactive decay]]