In the lab you have observed sodium D doublet lines from a sodium arc lamp. Choo

Question

In the lab you have observed sodium D doublet lines from a sodium arc lamp. Choose all that are correct about the sodium D doublet line observation from the following.

The spectral lines are the light emitted as the sodium atoms are ionized.

The two spectral lines in the doublet corresponds to the Balmer series of the sodium atoms.

The angular separation of the doublet lines is greater if more light comes through the collimator slit. For a clearer observation of the doublet lines, it is better to have a narrower collimator slit as long as enough light comes through for the observation.

Explanation / Answer

The following are correct

The two spectral lines in the doublet corresponds to the Balmer series of the sodium atoms.

The angular separation of the doublet lines is greater if more light comes through the collimator slit. For a clearer observation of the doublet lines, it is better to have a narrower collimator slit as long as enough light comes through for the observation.

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