The Doppler effect due to motion of excited atoms in a glowing gas tends to make the spectral lines slightly

Question

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The Doppler effect due to the motion of excited atoms in a glowing gas causes the spectral lines to broaden or become thicker. This is because the motion of the atoms towards or away from the observer shifts the wavelengths of the emitted light, spreading the spectral lines over a wider range of wavelengths.

The Doppler Effect Due to Motion of Excited Atoms in a Glowing