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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12 x 103J

24 x 103J

48 x 103J

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

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