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(A) The intensity $(I)$ of radiation is defined as the energy incident per unit area per unit time.For a monochromatic light source,the energy of a si

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Intensity is directly proportional to the number of photons per unit area per unit time.

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(A) The intensity $(I)$ of radiation is defined as the energy incident per unit area per unit time.For a monochromatic light source,the energy of a single photon is given by $E = h
u$,where $h$ is Planck's constant and $
u$ is the frequency.If $N$ is the number of photons incident on an area $A$ in time $t$,the total energy is $E_{total} = N \cdot h
u$.Therefore,the intensity is $I = \frac{E_{total}}{A \cdot t} = \frac{N \cdot h
u}{A \cdot t}$.Since $h$,$
u$,$A$,and $t$ are constants for a given setup,the intensity $I$ is directly proportional to the number of photons $N$ incident per unit area per unit time $(I \propto N)$.

What is the relationship between the number of photons and the intensity of radiation?

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