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Light with an energy flux of 19 W/ cm2 falls on a non-reflecting surface at normal incidence' If the surface has an area of 20cm2, the average force exerted on the surface during the span of 30 min is

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a

1⋅2×10−6N

b

1⋅5×10−6N

c

2×10−6N

d

3×10−6N

answer is A.

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Detailed Solution

Total energy falling on the surfaceU=18W/cm2×(30×60s)×20cm2 =6⋅48×105J Now, momentum p=Uc=6⋅48×1053⋅0×108kg−m/s=2⋅16×10−3kg−m/s Average force exerted F=pt=2⋅16×10−330×60=1.2×10−6N

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