What is the intensity of radiation (light)?

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(A) The intensity of radiation (light) is defined as the amount of energy incident per unit area per unit time,perpendicular to the direction of propa

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The energy emitted per unit area per unit time.

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(A) The intensity of radiation (light) is defined as the amount of energy incident per unit area per unit time,perpendicular to the direction of propagation of the wave.Mathematically,it is given by $I = \frac{E}{A \cdot t}$,where $E$ is the energy,$A$ is the area,and $t$ is the time.In the context of the photoelectric effect,intensity is directly proportional to the number of photons incident on the surface per unit time.

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