A plane electromagnetic wave of 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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a
6.6 × 10−11 N
b
1.33 × 10−11 N
c
1.33 × 10−10 N
d
6.6 × 10−10 N
answer is C.
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Detailed Solution
Radiation force = momentum transferred per second by electromagnetic wave to the mirror=2SavAc=2×(10)×20×10−43×108=1.33 × 10−10 N