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Light is incident normally on a completely absorbing surface with an energy flux of 25 W cm –2 . If the surface has an area of 25 cm 2 , the momentum transferred to the surface in 40 min time duration will be :

1. 6.3 × 10 –4 Ns
2. 5.0 × 10 –3 Ns
3. 1.4 × 10 –6 Ns
4. 3.5 × 10 –6 Ns

Correct answer: 5.0 × 10 –3 Ns

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