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Light with an energy flux of \( 20 \mathrm{~W} / \mathrm{cm}^{2} \) falls on a non-reflecting surface at normal incidence. If the surface has an area of \( 30 \mathrm{~cm}^{2} \).
P the total momentum delivered (for complete absorption) during

W 30 minutes is
(a) \( 36 \times 10^{-5} \mathrm{~kg} \mathrm{~m} / \mathrm{s} \).
(b) \( 36 \times 10^{-4} \mathrm{~kg} \mathrm{~m} / \mathrm{s} \).
(c) \( 108 \times 10^{4} \mathrm{~kg} \mathrm{~m} / \mathrm{s} \).
(d) \( 1.08 \times 10^{7} \mathrm{~kg} \mathrm{~m} / \mathrm{s} \).
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