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If the series limit frequency of the Lym...

If the series limit frequency of the Lyman series is `v_(L)`, then the series limit frequency of the Pfund seriesis :

A

`v_L/16`

B

`v_L/25`

C

`25v_L`

D

`16 v_L`

Text Solution

Verified by Experts

The correct Answer is:
B
Frequency for electron transition is given by
`v=RcZ^2(1/n_1^2-1/n_2^2)`
For series limit of Lyman we have `n_1=1` and `n_2=oo`
`v_L =RcZ^2(1/1-1/oo)=RcZ^2`
For series limit of Pfund we have `n_1=5` and `n_2=oo`
`v_P=RcZ^2(1/25-1/oo)=(RcZ^2)/25`
`rArr v_P=v_L/25`
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