Q. 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 30 cm2, the total momentum delivered (for complete absorption) during 30 minutes is
  • (A) 36 × 10-5 kg m/s
  • (B) 36 × 10-4 kg m/s
  • (C) 108 × 104 kgm/s
  • (D) 1.08 × 107 kg m/s
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✅ Correct Answer: (B) 36 × 10-4 kg m/s

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