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Spectral lines have a finite width even though atomic energy levels are discrete, because ... atoms in a gas are not at rest ? atomic transitions always emit a continuous spectrum ? many different atomic transistions contribute to spectral line ? we do not measure precisely enough ?   which one is correct?

Spectral lines have a finite width even though atomic energy levels are discrete, because ... atoms in a gas are not at rest ? atomic transitions always emit a continuous spectrum ? many different atomic transistions contribute to spectral line ? we do not measure precisely enough ?   which one is correct?

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Spectral lines have a finite width even though atomic energy levels are discrete, because ...

  1. atoms in a gas are not at rest ?

  2. atomic transitions always emit a continuous spectrum ?

  3. many different atomic transistions contribute to spectral line ?

  4. we do not measure precisely enough ?

 

which one is correct?

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