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In physics and many other areas of science and engineering the intensity or flux of radiant energy is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy.
The SI unit for intensity is watts per square meter (W/m2) (W / m 2). For example, infrared and visible energy from the Sun impinge on Earth at an intensity of 1300W/m2 1300 W / m 2 just above the atmosphere. There are other intensity-related units in use, too. The most common is the decibel.
The amount of energy passing through a unit area per unit time is the intensity of the wave. Therefore, the intensity is defined as power per unit area. Intensity is equal to the power per unit area. The area the wave passes through is perpendicular to the direction of its velocity.
Previously, we defined intensity as the power per unit area carried by a wave. Power is the rate at which energy is transferred by the wave. In equation form, intensity \ (I\) is. \ [I = \frac {P} {A}, \label {17.8}\] where \ (P\) is the power through an area \ (A\). The SI unit for \ (I\) is W/m 2.
The energy and power of a wave are proportional to the square of the amplitude of the wave and the square of the angular frequency of the wave. Intensity is defined as the power divided by the area. …
Therefore, we define a property called intensity of the wave by dividing power by the area of the surface the wave is flowing through, here it will be \ (A_\perp\text {.}\) \begin {equation} I = \frac {P_\text {av}} {A_\perp} = \frac {2 \pi^2 \mu \lambda f^3 D^2} {A_\perp}.\label {eq-definition-of-intensity}\tag {14.7.7} \end {equation}
Calculate the intensity from power and area, with different units. In physics, intensity is power per area, the formula is I=P/A. The unit of intensity calculates as watts per square meter, W/m². Intensity commonly is used for radiant energy.
