Light from a compact fluorescent lamp is observed through a cloud of cool nitrog

Question

Light from a compact fluorescent lamp is observed through a cloud of cool nitrogen gas. Again two students are having a discussion about the kind of spectra that they would see.

Student 1: We would see absorption line spectra and the missing lines would correspond to the light from the compact fluorescent lamp.

Student 2: I disagree. We would see an emission line spectra corresponding to nitrogen. This would happen because the nitrogen gas would absorb some energy from the compact fluorescent lamp and would reemit this energy which would result in an emission line spectra.

Which student, if any, do you agree with? Clearly explain why you agree or disagree with each student's statement.

Explanation / Answer

Student 1 is wrong. Fluoroscent lamp is not a hot source of radiation.

Student 2 is right.it is the gas that causes the absorption lines to appear in what would otherwise appear to be a continuous spectrum

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