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(C) The momentum of a photon is given by $p = E/c$.The intensity $I$ is defined as the energy incident per unit area per unit time,$I = E/(At)$.For a

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$I/c$

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(C) The momentum of a photon is given by $p = E/c$.The intensity $I$ is defined as the energy incident per unit area per unit time,$I = E/(At)$.For a non-reflecting (perfectly absorbing) surface,the momentum transferred per unit area per unit time is equal to the radiation pressure $P$.Since the photon is absorbed,the change in momentum per unit area per unit time is $\Delta p / (At) = (E/c) / (At) = I/c$.Therefore,the radiation pressure exerted on a non-reflecting surface is $P = I/c$.

The pressure exerted by an electromagnetic wave of intensity $I \ (W/m^2)$ on a non-reflecting surface is [$c$ is the velocity of light].

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