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Light with an energy flux of 20 W/cm2 falls on a non-reflecting

Question:

Light with an energy flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 30cm2, the total momentum delivered during 30 minutes is

(a) 36 × 10-5 kg m/s

(b) 36 × 10-4 kg m/s

(c) 108 × 104 kg m/s

(d) 1.08 × 107 kg m/s

Solution:

(b) 36 × 10-4 kg m/s

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