A light with an energy flux of $18 \mathrm{~W} \mathrm{~cm}^{-2}$ falls on a non-reflecting surface at…

A light with an energy flux of $18 \mathrm{~W} \mathrm{~cm}^{-2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 \mathrm{~cm}^2$, the average force exerted on the surface during a 30 minute time span is ____ $\left(c=3 \times 10^8 \mathrm{~ms}^{-1}\right)$.
  1. $1.2 \times 10^{-6} \mathrm{~N}$
  2. $2.1 \times 10^{-6} \mathrm{~N}$
  3. $3.1 \times 10^{-6} \mathrm{~N}$
  4. $4.8 \times 10^{-6} \mathrm{~N}$

Solution

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Asked in: AP EAMCET 2017 (24 Apr Shift 2)

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