Question: Q. 5. Define intensity of radiation on the basis of photon nature of light. Write its S.I. unit.
R [OD I, II, III 2014]
Solution:
Ans. The amount of light energy/photon energy, incident per metre square per second is called intensity of radiation.
S.I. Unit : $\mathrm{W} / \mathrm{m}^{2}$ or $\mathrm{J} / \mathrm{s}-\mathrm{m}^{2}$
$1 / 2$
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