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Light with an average flux of \( 20 \mathrm{~W} / \mathrm{cm}^{2} \) falls on nonreflecting surface at normal incidence having surface area
\( \mathrm{P} \) \( 20 \mathrm{~cm}^{2} \). The energy received by the surface during time

W span of 1 minute is:
(2020)
(a) \( 12 \times 10^{3} \mathrm{~J} \)
(b) \( 24 \times 10^{3} \mathrm{~J} \)
(c) \( 48 \times 10^{3} \mathrm{~J} \)
(d) \( 10 \times 10^{3} \mathrm{~J} \)
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