Radiations of intensity 0.5 Wm-2 are striking a metal plate. The pressure on the plate is:

$0.166 \times 10^{-8} Nm^{-2}$ $0.332 \times 10^{-8} Nm^{-2}$ $0.111 \times 10^{-8} Nm^{-2}$ $0.083 \times 10^{-8} Nm^{-2}$

$0.166 \times 10^{-8} Nm^{-2}$

$P = \frac{I}{c}=\frac{0.5}{3 \times 10^8}=0.166 \times 10^{-8} Nm^{-2}$