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Question:

If the series limit frequency of the Lyman series is vL, then the series limit frequency of the Pfund series is?

vL/16

25vL

vL/25

16vL

Solution:

given that ν=R[1/n12 - 1/n22] for lyman wave number ν=1/λ so ν=R C[1/n12 - 1/n22] ν=R C[1/12 - 1/∞] so νL=R C for Pfund νP=R C[1/52 - 1/∞]=R C/25=νL/25 so option C is correct.