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If the series limit frequency of the Lyman series is u_L, then the series limit frequency of the Pfund series is

Asked in JEE Main 2018 · Spectral series and wavelengths

(1) 25 u_L
(2) 16 u_L
(3) u_L/16
(4) u_L/25

Answer: (4) u_L/25

Step-by-step solution

Series limit: u=(Rc)/(n_f²); Lyman n_f=1, Pfund n_f=5.

u_P=(u_L)/(25)

Why the other options are wrong

(1) Multiplies instead of dividing.
(2) Uses Brackett (n=4) and multiplies.
(3) Uses Brackett (n=4).

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