You are heating a jar full of hydrogen and observing its spectrum. When you add more hydrogen to it, what happens to the spectral lines in the spectrum?
A. The positions of emission lines will change.
B. The positions of emission lines will remain the same, but the lines will get broader and brighter.
C. You will start seeing lots of absorption lines instead of emission lines.
D. There will be no change in the spectrum.
Answer: B
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