## Two objects are in all respects identical except for the fact that one was coated with a substance that is an excellent reflector of light w

Question

Two objects are in all respects identical except for the fact that one was coated with a substance that is an excellent reflector of light while the other was coated with a substance that is a perfect absorber of light. You place both objects at the same distance from a powerful light source so they both receive the same amount of energy U from the light. The linear momentum these objects will receive is such that:

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3 years 2021-08-12T19:37:45+00:00 1 Answers 13 views 0

absorbent    p = S / c

reflective         p = 2S/c

Explanation:

The moment of radiation on a surface is

p = U / c

where U is the energy and c is the speed of light.

In the case of a fully absorbent object, the energy is completely absorbed. The energy carried by the light is given by the Poynting vector.

p = S / c

in the case of a completely reflective surface the energy must be absorbed and remitted, therefore there is a 2-fold change in the process

p = 2S/c