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प्रश्न
What condition of an atomic gas or vapour produces an emission line spectrum?
पर्याय
It absorbs radiation of certain wavelengths.
It produces dark lines in a continuous spectrum.
White light passes through it.
It is excited at low pressure.
MCQ
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उत्तर
An emission line spectrum is obtained from an excited atomic gas or vapour at low pressure. The gas emits radiation rather than absorbing wavelengths from white light.
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