Final answer:
Intensity in physics is the power per unit area carried by a wave, related to properties like the brightness of light or the loudness of sound, and is measured in Watts per square meter (W/m²).
Step-by-step explanation:
The quality or condition of being intense in the context of physics refers to intensity. Intensity is a property of wave-propagated energy which is related to the amplitude of the wave. It is often described in terms of the brightness of light or the loudness of sound. In technical terms, intensity is defined to be the power per unit area carried by a wave. The power mentioned here is the rate at which energy is transferred by the wave.
In equation form, intensity I is expressed as power (P) divided by area (A), and it is measured in units of Watts per square meter (W/m²). Intensity is an important concept when analyzing electromagnetic fields, such as the strength of an electric or magnetic field, or when dealing with other kinds of energy like heat, sound, etc.