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Asked in CBSE AIPMT 1993 · Line spectra and their sources
Idea: sharp emission lines need free atoms in a gas, each radiating at its own discrete transition energies.
A neon street sign is a low-pressure gas discharge, so the neon atoms radiate individually.
Its spectrum is a set of isolated bright lines, which is a line emission spectrum.
The other three are all continuous sources, whether seen directly or through a filter or an absorbing layer.
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