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) You will start seeing lots of absorption lines instead of emission lines.
C) The positions of emission lines will remain the same, but the lines will get broader and brighter.
D) There will be no change in the spectrum.

Question

Quizplus · Accepted Answer

The positions of the emission lines remain the same because they are determined by the energy levels of the hydrogen atoms, which do not change. However, adding more hydrogen increases the density, leading to broader and brighter lines due to increased collisions and more atoms emitting light.

You Are Heating a Jar Full of Hydrogen and Observing