Plane electromagnetic waves 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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a
S/c (3 – f)
b
S/c (2 – f)
c
S/c (4 – f)
d
S/c (f – 1)
answer is B.
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Detailed Solution
P=Pabsorbed light+Preflected ; P=I1C+2I-I1CLet I1 be the intensity absorbed, fractionf=I1I=I1S ⇒I1=SfP=SfC+2S-SfC ⇒P=SC2-f