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A surface is placed perpendicular to a beam of light of constant irradiance ( $l$ ). Suppose that the fraction of the irradiance absorbed by the surface is $\alpha ...

Question

A surface is placed perpendicular to a beam of light of constant irradiance ( $l$ ). Suppose that the fraction of the irradiance absorbed by the surface is $\alpha .$ Show that the pressure on the surface is given by $$\mathscr{P}=(2-\alpha) I / c$$

A surface is placed perpendicular to a beam of light of constant irradiance ( $l$ ). Suppose that the fraction of the irradiance absorbed by the surface is $\alpha .$ Show that the pressure on the surface is given by $$\mathscr{P}=(2-\alpha) I / c$$



Answers

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