If \( 2.5 \times 10^{-6} \mathrm{~N} \) average force is exerted by...

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If \( 2.5 \times 10^{-6} \mathrm{~N} \) average force is exerted by a light
P
wave on a non-reflecting surface of \( 30 \mathrm{~cm}^{2} \)
W
area during 40 minutes of time span, the energy flux of light just before it falls on the surface is 2 \( \mathrm{W} / \mathrm{cm} \).
(Round off to the Nearest Integer)
(Assume complete absorption and normal incidence conditions are there)
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