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The pressure exerted by an electromagnetic wave of intensity $I$ (watt $/ \mathrm{m}^2$ ) on a nonreflecting surface is [ $c$ is the velocity of light]
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The correct answer is:
$I / c$
Pressure = Force $/$ area
$$
I=\frac{\text { Energy }}{\text { area-time }}=\frac{F \cdot S}{A t}=\frac{F c}{A} \quad I / c=P
$$
$$
I=\frac{\text { Energy }}{\text { area-time }}=\frac{F \cdot S}{A t}=\frac{F c}{A} \quad I / c=P
$$
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