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Define intensity of radiation on the bas...

Define intensity of radiation on the basis of photon picture of light. Write its S.I. unit.

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The amount of light `"energy" // "Photon"` energy, incident per metre square per second is called intensity of `"Joule" // "Sec-metre"^(2)` radiation.
SI Unit : `W // m` or `"Joule" // "Sec-metre"^(2)`).
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