1.

In the given diagram, the energy levels of hydrogen atom have been shown along with some transitions marked A, B, C, D and E. The transition A, B and C respectively represent :

Answer»

The first member of the Lyman series, third member of Balmer series and the SECOND member of Paschen series
Second member of Balmer series, and third member of Paschen series
The series limit of Lyman series, second member of Balmer series and second member of Paschen series
The series dimit of Lyman series, third member of Baltner series and second member of Paschen series

Solution :`E_(n_(2))-E_(n_(i))=HV-(HC)/(lambda)`
`2E-E=(hc)/(lambda)`
Also, `(4E)/(3)-E=(hc)/(lambda)`
or `E=(hc)/(lambda) or E/3=(hc)/(lambda.)`
Dividing we get 3 `=(lambda.)/(lambda) , lambda.=3lambda`


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