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 min is:

Question

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 min is:, 12 × 10 3 J, 24 × 10 3 J, 48 × 10 3 J, 10 × 10 3 J

MARKS App · Accepted Answer

We know that, I = E A t E = I A t ⇒ E = 20 10 − 4 × 20 × 10 − 4 × 60 ⇒ E = 24 × 10 3 J

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