SAT Subject Physics Practice Question 448: Answer and Explanation

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Question: 448

9. An electric current is applied to a gas discharge tube, causing it to glow. When the discharge is viewed through a spectroscope, which type of spectrum is seen?

A. Monochromatic
B. Continuous
C. Line absorption
D. Line spectra
E. Polarimeter

Correct Answer: D


The correct answer is (D). The energized atoms of the gas emit energy in specific regions of the visible spectrum called line spectra.

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