If a Certain Gas Is Heated and Observed Through a Grating

question 92

Multiple Choice

If a certain gas is heated and observed through a grating, a bright line spectrum will be seen. If instead a source of continuous spectrum shines through a cooler sample of this same gas, a dark absorption spectrum is observed. How do the positions of the lines in these two spectra compare?

• A) All the lines in the spectrum from the hot gas will be at higher frequencies than the corresponding lines in the spectrum of the cooler gas.
• B) All the lines in the spectrum from the hot gas will be at lower frequencies than the corresponding lines in the spectrum of the cooler gas.
• C) The lines in the two spectra will be at the same frequencies. They will be the same spectra.
• D) These two processes produce spectra by completely different means, and there will be no relationship at all between the two spectra.

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