Suppose you look at a detailed spectrum of visible light from some object. how can you decide whether it is an emission line spectrum or an absorption line spectrum?

By observing the color of lines in the spectrum.

Explanation:

There are two types of lines in the spectrum explained below:

i) Bright lines: Bright lines occurs on the spectrum when atoms emit photons. These bright lines show the emission line spectrum.

ii) Dark Lines: Dark lines occurs on the spectrum when atoms absorb photons. These black lines show the absorption line spectrum.

Hence, by observing the color of lines it is possible to identify emission line spectrum and absorption line spectrum.

explanation:

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