Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is:
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a
12 x 103J
b
24 x 103J
c
48 x 103J
d
10 x 103J
answer is B.
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Detailed Solution
E=Intensity x surface area x time =20×104×20×10−4×60=24×103J