8.Electromagnetic waves
medium

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 recelved by the surface during time span of $1$ minute is $............J$

A

$48 \times 10^{3}$

B

$10 \times 10^{3}$

C

$12 \times 10^{3}$

D

$24 \times 10^{3}$

(NEET-2020)

Solution

$I =\frac{ E }{ At }$

$E = IAt$

$=\frac{20}{10^{-4}} \times 20 \times 10^{-4} \times 60$

$=24 \times 10^{3}\, J$

Standard 12
Physics

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