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A plane electromagnetic wave is incident on a plane surface of area A, normally and is perfectly reflected. If energy E strikes the surface in time t then average pressure exerted on the surface is
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Correct option is C
Incident momentum, p=Ec For perfectly reflecting surface with normal incidence Change in momentum=Δp=2p=2EcForce=F=ΔpΔt=2EctPressure=P=FA=2EctASimilar Questions
A plane em wave of wave intensity of 10 W/m2 strikes a small mirror of area 20 cm2, held perpendicular to the approaching wave. The radiation force on the mirror will be
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