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When light reflects from a smooth surface, it undergoes a change in?
a.wavelength.
b.All of these.
c.frequency.
d.None of these.
e.speed.
None of these. Its speed is a function of the material it travels through, but since it reflected, it is in the same material (probably air) so the speed is the same. Wavelength is also a function of the material, and if the wavelength and material dont change, the frequency wont change. So the answer is none of them.
However, if the surface is moving, a and c would change. But you said nothing about the surface moving.
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