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Light with an energy flux of \( 20 \mathrm{~W} / \mathrm{cm}^{2} \) falls on a
\( \mathrm{P} \) non-reflecting surface at normal incidence. If the

W surface has an area of \( 30 \mathrm{~cm}^{2} \), the total momentum delivered (for complete absorption) during \( 30 \mathrm{~min} \) is
(1) \( 36 \times 10^{-5} \mathrm{~kg}-\mathrm{m} / \mathrm{s} \)
(2) \( 36 \times 10^{-4} \mathrm{~kg}-\mathrm{m} / \mathrm{s} \)
(3) \( 108 \times 10^{4} \mathrm{~kg}-\mathrm{m} / \mathrm{s} \)
(4) \( 1.08 \times 10^{7} \mathrm{~kg}-\mathrm{m} / \mathrm{s} \)
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