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Light with an energy flux of $25 \times 10^{4} W / m^{2}$ falls on a perfectly reflecting surface area is $15 c m^{2}$ , the average force exerted on the surface is

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1.25×10−6N

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detailed solution

Correct option is B

Average force= Average radiation pressure X areaForce=2IC×A=2×25×104×15×10−43×108=2.5×10−6N

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Light with an energy flux of 25×104W/m2 falls on a perfectly reflecting surface area is 15 cm2, the average force exerted on the surface is

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Light with an energy flux of $25 \times 10^{4} W / m^{2}$ falls on a perfectly reflecting surface area is $15 c m^{2}$ , the average force exerted on the surface is