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Q.

A plane electromagnetic wave of wave intensity 6 W/m2 strikes a small mirror of area 39 cm2, held perpendicular to the approaching wave. The momentum transferred in kg ms-1 by the wave to the mirror each second will be

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a

2.4×10-9

b

4.8×10-7

c

1.2×10-10

d

3.6×10-8

answer is A.

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Detailed Solution

Transferred momentum/second to mirror is

P=2ASC=1.21×10-10 kg m s-1

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