If 2.5×10−6N average force is exerted by a light wave on a non-reflecting surface of 30cm2 area during 40 minutes of time span, the energy flux of light just before it falls on the surface is _____ W/cm2. (Round off to the Nearest Integer)

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answer is 25.

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Detailed Solution

Force exerted by light beam of intensity I when it falls on a non-reflecting surface of surface area A is F=ICA⇒I=FCAI=2.5×10−6×3×10830=2.5×10−6×10−1×108 =25W/cm2

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