Light with an energy flux of 18 W/cm2 falls on a non reflecting surface at normal incidence. If the surface has an area of 20 cm2 . The average force exerted on the surae during a 30 minute time spam is
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a
1.2×10−6N
b
1.6×10−6N
c
2×10−6N
d
1×10−6N
answer is A.
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Detailed Solution
The average force exerted on non reflecting surface is F=IcA=18×203×108=1.2×10−6N