If a Certain Gas Is Heated and Observed Through a Grating,a

question 113

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 of 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 of 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.