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If 917 Å be the lowest wavelength of Lyman series then the lowest wavelength of Balmer series will be Å .

Correct answer

3668

Step-by-step solution

Using Rydberg's formula, 1 λ = R Z 2 1 n 2 1 - 1 n 2 2 For the lowest wavelength in Lyman series, n 1 = 1 ,   n 2 = ∞ . 1 λ = R Z 2 1 1 2 - 1 ∞ 2 = R Z 2 For Balmer series, n 1 = 2 ,   n 2 = ∞ 1 λ ' = R Z 2 1 2 2 - 1 ∞ 2 = R Z 2 4 So, 1 λ ' = 1 4 λ ⇒ λ ' = 4 × 917     Å = 3668     Å

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