Physics

Problem

Light is incident normally on a completely absorbing surface with an energy flux of

25 \,\text{W cm}^{-2}

. If the surface has an area of

25 \,\text{cm}^2

, the momentum transferred to the surface in

40 \,\text{min}

time duration will be: a.

6.3 \times 10^{-4} \text{ Ns}

1.4 \times 10^{-6} \text{ Ns}

5.0 \times 10^{-3} \text{ Ns}

3.5 \times 10^{-6} \text{ Ns}