In the lab you have observed sodium D doublet lines from a s

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 sodium D lines are the strongest spectral lines from sodium atoms in the visible wavelength light range.

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

Sodium D lines are doublet lines (narrowly separated two lines) because of the electrostatic interaction between the electrons in the sodium atom.

For a clearer observation of the doublet lines, it is better to have a wider collimator slit because the angular separation of the doublet becomes greater if more light comes through the collimator.

Solution

Sodium lines are strongest spectral lines from sodium atom. These lines correspond to balmer series. Therefore first two conclusions are true.