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  • If N average force is exerted by a light wave on a non - reflecting surface of 30 cm2 area during 40 minutes of time span, the enrgy flux of light just befor

If 2.5 \times 10^{-6} N average force is exerted by a light wave on a non - reflecting surface of 30 cm2 area during 40 minutes of time span, the enrgy flux of light just before it falls on the surface is ______ W/cm2 . (Round off to the Nearest Integer) (Assume complete absorption and normal incidence conditions are there)
Option: 1 25
Option: 2 30
Option: 3 35
Option: 4 40

Answers (1)

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\begin{array}{l} F=\frac{I A}{C} \\ \\ I=\frac{F C}{A}=\frac{2.5 \times 10^{-6} \times 3 \times 10^{8}}{30}=25 \mathrm{~W} / \mathrm{cm}^{2} \end{array}

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