Light with energy flux of \( 18 \mathrm{~W} / \mathrm{cm}^{2} \) falls on a non reflecting surfa...
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0Light with energy flux of \( 18 \mathrm{~W} / \mathrm{cm}^{2} \) falls on a non reflecting surface of area \( 20 \mathrm{~cm}^{2} \) at normal incidence. The momentum delivered in 30 minutes is
(a) \( 1.2 \times 10^{-6} \mathrm{kgms}^{-1} \)
(b) \( 2.16 \times 10^{-3} \mathrm{kgms}^{-1} \)
(c) \( 1.18 \times 10^{-3} \mathrm{kgms}^{-1} \)
(d) \( 3.2 \times 10^{-3} \mathrm{kgms}^{-1} \)
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