Test: College Physics

1.

A monochromatic light source is incident on a neutral density filter which decreases the light source's intensity by a factor of 3 but does not change its color. What happens to the energy of a photon in the less intense beam?

The photon energy increases by a factor of 3.

The photon energy decreases only slightly.

None of these

The photon energy decreases by a factor of 9.

The photon energy decreases by a factor of 3.

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