A laser emits a cylindrical beam of light 4.0 mm in diameter. The average power of...

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Physics

A laser emits a cylindrical beam of light 4.0 mm in diameter.The average power of the laser is 2.8 mW . The laser shines itslight on a perfectly absorbing surface.

How much energy does the surface receive in 14 s ?

What is the radiation pressure exerted by the beam?

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If the light beam falls in aperfectly    See Answer
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