1.

If the series limit frequency of the Lyman series is v_(L), then the series limit frequency of the Pfund series is ......

Answer»

`25v_(L)`
`16v_(L)`
`(v_(L))/(16)`
`(v_(L))/(25)`

Solution :`hf_(L)=E_(0)[(1)/(n_(1)^2)-(1)/(n_(2)^(2))]`
`=E_(0)[(1)/(1^(2))-(1)/(OO^(2))]""n_(1)=1,n_(2)=oo`
`:.hf_(L)=E_(0)""....(1)`
`hf_(P)=E_(0)[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]`
`=E_(0)[(1)/(5^(2))-(1)/(oo)]""n_(1)=5,n_(2)=oo`
`:.hf_(P)=(E_(0))/(25)""......(2)`
Taking ratio of equation (1) and (2),
`:.(f_(L))/(f_(P))=25`
`:.f_(P)=(f_(L))/(25)`


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