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A light source emits a parallel beam of light of power 20 W. Wavelength of the light is 600 nm and it is incident on a perfectly absorbing surface . Find the number of photons absorbed by the surface per second and the total force exerted on the surface.

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To solve the problem, we need to find two things: the number of photons absorbed by the surface per second and the total force exerted on the surface. ### Step 1: Calculate the energy of a single photon The energy \( E \) of a single photon can be calculated using the formula: \[ E = \frac{hc}{\lambda} \] where: ...
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