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Question

Plane electromagnetic wave of intensity S are incident normally on a flat surface.Only a fraction f of the incident energy is absorbed.What is the radiation pressure?

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Solution

Given,

Radiation intensity= S

Reflected radiation =S(1f)

Speed of light is C=3×108ms1

Radiation pressure, P=Sc+S(1f)c=2ScSfc

Hence, radiation pressure, S(2f)c Nm2


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