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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Electromagnetic Waves
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Light with an energy flux of $18\: W/cm^2$ surface has an area of $ 20\: cm^2$ falls on a non-reflecting surface at normal incidence. If the , the average force exerted on the surface during a $30$ minute time span is

$\begin {array} {1 1} (a)\;0.12 \times 10^{-6}N & \quad (b)\;12 \times 10^{-6}N \\ (c)\;12 \times 10^{-8}N & \quad (d)\;1.2 \times 10^{-6}N \end {array}$

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