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For any given series of spectral lines of atomic hydrogen, let Δ v = max v – min v be the difference in maximum and minimum frequencies in cm –1 . The ratio Δ Lyman v / Δ Balmer v is :

1. 4 : 1
2. 9 : 4
3. 27 : 5
4. 5 : 4

Correct answer: 9 : 4

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