A sample of hydrogen gas is heated and produces a spectrum of bright lines.A blackbody spectrum is observed through a cooler sample of hydrogen gas.This situation also produces a line spectrum,and the locations of these lines:
A) are in exactly the same places occupied by the lines in the first bright line spectrum. In fact, these two bright line spectra are identical in every way.
B) are in exactly the same places occupied by the lines in the bright line spectra. These lines, however, are dark absorption lines.
C) are in different places from the lines in the bright line spectrum.
D) match the lines in the bright line spectrum. However, there are many additional lines in this dark line spectrum.

Question

Quizplus · Accepted Answer

When a blackbody spectrum is observed through a cooler sample of hydrogen gas, it produces a dark absorption line spectrum. The locations of these lines are in exactly the same places occupied by the lines in the bright line spectra. However, they are dark because they appear as absorption lines instead of emission lines. This is due to the cooler gas absorbing certain wavelengths of light, creating dark lines in the spectrum. Therefore, the best choice is B.

A Sample of Hydrogen Gas Is Heated and Produces a Spectrum