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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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