If the series limit frequency of the Lyman series is νL, then the series limit frequency of the Pfund series is: (a) νL/25 (b) 25νL (c) 16νL (d) νL/16

Answer: (a). Series limit frequency ν = (Rc)/(n₁²). Lyman ( n₁ = 1): νL = Rc; Pfund ( n₁ = 5): ν = Rc/25. So the answer is (a) νL/25.

If the series limit frequency of the Lyman series is νL, then the… | JEE Main 2018

Q53JEE Main 2018Easy

Hydrogen Spectrum & Spectral Series

If the series limit frequency of the Lyman series is $\nu_L$ , then the series limit frequency of the Pfund series is:

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Answer: (a)

Series limit frequency $\nu = \frac{Rc}{n_1^2}$ .
Lyman ( $n_1 = 1$ ): $\nu_L = Rc$ ; Pfund ( $n_1 = 5$ ): $\nu = \frac{Rc}{25}$ .
So the answer is (a) $\nu_L/25$ .