A parallel beam of monochromatic light of wavelength \( 500 \mathrm{~nm} \) is incident normally...

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A parallel beam of monochromatic light of wavelength \( 500 \mathrm{~nm} \) is incident normally on a perfectly absorbing surface. The power through any cross section of the beam is \( 10 \mathrm{~W} \). Find (a) the number of photons absorbed per second by the surface and (b) the force exerted by the light beam on the surface.
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