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Q.

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 , find the average force exerted on the surface during a 30minute time span.

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a

2.4×10−6N

b

1.2×10−6N

c

2.16×10−3N

d

4.32×10−3N

answer is B.

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Detailed Solution

U=IAt=18×20×30×60=6.48×105J P=UC=6.48×1053×108=2.16×10−3F=Pt=2.16×10−330×60=1.2×10−6N
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