Published by:
CGP EDU Academic Team
Published on: August 21, 2026
Light with an average flux of 20 W/cm 2 falls on a non-reflecting surface at normal incidence having surface area 20 cm 2 . The energy received by the surface during time span of 1 minute is :
Text Solution
Verified by ExpertsThe correct answer is:
Given that,
Intensity, I = 20 W/cm 2
Area of cross section, A =20 cm 2
Time, t = 1 min = 60 sec
Now,
Energy received = Intensity x Area x Time
E=IAt
= 20 x 20 x 60
= 24x 10 3 J
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