We know that, I=AtE
E=IAt
⇒E=10−420×20×10−4×60
⇒E=24×103J
NEET UG 2020 — Physics Electromagnetism
Light with an average flux of 20Wcm−2 falls on a non-reflecting surface at normal incidence having surface area 20cm2. The energy received by the surface during time span of 1min is:
Held on 30 Apr 2020 · Verified 9 Jul 2026.
12×103J
24×103J
48×103J
10×103J
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