Question

Describe spectrum from the Na source

Answer 1

Spectrum of the Na source.

This spectrum is consist of bright doublet i.e Sodium D-lines ,whose range is 588.9950 and 589.5924 nanometers. 

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Answer 2

When the vapour of the element is kept in a discharge tube and subjected to high potential then line spectrum is obtained.
For example :
Sodium gives two bright lines of wavelengths 5890A⁰ and 5896A⁰ in the yellow regio.
They are separated by dark space.