SAT Subject Physics Practice Question 568: Answer and Explanation

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Question: 568

9. The discrete spectral lines of line spectra occur when excitation of electrons takes place in

A. solids.
B. liquids.
C. gases.
D. plastics.
E. all of these.

Correct Answer: C


The correct answer is (C). Gases provide electron sources that can be excited by the photons of light that strike them.

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