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The sodium doublet lines are due to transitions from 2p3/2 and 2p1/2 levels to 2s1/2 level. On application of a weak magnetic field, the total number of allowed transitions becomes

The sodium doublet lines are due to transitions from 2p3/2 and 2p1/2 levels to 2s1/2 level. On application of a weak magnetic field, the total number of allowed transitions becomes Correct Answer 10

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