SAT Subject Physics Practice Question 479: Answer and Explanation

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Question: 479

10. A photovoltaic metal absorbs a photon of yellow light and immediately emits an ultraviolet photon. This is called

A. fluorescence.
B. influorescence.
C. phosphorescence.
D. photoluminescence.
E. This is not possible.

Correct Answer: E


The correct answer is (E). The photon of yellow light does not contain enough energy to cause the metal to emit an ultraviolet photon. Remember the energy of a photon is directly related to the frequency of the electromagnetic radiation. The higher the frequency, the higher the energy of the photon of the radiation. Ultraviolet light has a much higher frequency than yellow light, thus its photon is more energetic.

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