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Question

Light with an energy flux of $$25 \times 10^4 wm^{-2}$$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $$15 cm^2$$, the average force exerted on the surface is


A
1.25×106N
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B
2.50×106N
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C
1.20×106N
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D
3.0×106N
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Solution

The correct option is B $$2.50\times 10^{-6}N$$
$$F=\dfrac {2IA}{C}=\dfrac {2(25\times 10^4)(15\times 10^{-4})}{3\times 10^8}=2.5\times 10^{-6}N$$

Physics

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