Questions
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
detailed solution
Correct option is A
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=1.2×10−6NTalk to our academic expert!
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