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Taking the wavelength of first Balmer line in hydrogen spectrum (n = 3 to n = 2) as 660 nm, the wavelength of the 2nd Balmer line (n = 4 to n = 2) will be :

(1)  889.2 nm

(2)  388.9 nm

(3)  488.9 nm

(4) 642.7 nm 

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Correct option (3) 488.9 nm

Explanation:

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