Light with an average flux of 20 W cm - 2 falls on a non-reflecting surface at normal incidence having…

Light with an average flux of 20 W cm-2 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 min is:
  1. 12×103 J
  2. 24×103 J
  3. 48×103 J
  4. 10×103 J

Solution

We know that, I=EAt

E=IAt

⇒E=2010−4×20×10−4×60

⇒E=24×103 J

Asked in: NEET 2020 (Phase 1)

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