In physics, *intensity* describes the strength or energy flux density of a physical quantity per unit area, for example of sound waves, [[Electromagnetism|electromagnetic radiation]] or other [[Wave|wave phenomena]]. Specifically in the context of light, intensity refers to the amount of energy that light rays transport per unit time and unit area, which is directly related to the perceived brightness. Measuring intensity makes it possible to quantify the energy transfer of radiation sources and is of central importance in many areas of physics, from optics to acoustics. >[!read]- Further Reading >- [[Wave]] >- [[Light]] >[!ref]- References