Light with an average flux of $20 ext{ W/cm}^2$ falls on a non-reflecting surface at normal incidence having

Question

Light with an average flux of $20 	ext{ W/cm}^2$ falls on a non-reflecting surface at normal incidence having surface area $20 	ext{ cm}^2$. The energy received by the surface during time span of 1 minute is :

Accepted Answer

Energy received = Intensity $	imes$ Area $	imes$ Time. Given Intensity = $20 	ext{ W/cm}^2$, Area = $20 	ext{ cm}^2$, Time = 1 minute = 60 seconds. Energy = $20 	imes 20 	imes 60 = 24000 	ext{ J} = 24 	imes 10^3 	ext{ J}$.

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