CBSE Class 12 Physics 2014 Outside Delhi Set 1 Paper

Question : 4 of 30

Marks: +1, -0

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

Solution:

Intensity of radiation is defined as the energy transmitted to a surface per unit area per unit time by the photons striking on the surface. SI Unit:

\;{W}/{m^2} \;\text " or "\; \;{J}/{m^2 {\ sec}}

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