Question

explain line spectrum

Answer 1

spectral line is a dark or bright line in an otherwise uniform and continuous spectrum, resulting from emission or absorption of light in a narrow frequency range, compared with the nearby frequencies. Spectral lines are often used to identify atoms and molecules from their characteristic spectral lines.
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Answer 2

hii mate
here your answer is :-

An emission spectrum consisting of separate isolated lines is called line spectrum.

hope it helps you
---crystal