1.

The wave number of first line of Balmer seriesof H-atom is 15200cm^(-1). The wave number of first Balmer line of Li^(2+) ion is:

Answer»

`15200cm^(-1)`
`60800cm^(-1)`
`76000cm^(-1)`
`136,800cm^(-1)`

Solution :`lamda_(e)=h/(mv)=h/(MX)`
`lamda_(N)=h/(mv)=h/(1840mx)(m_(n)=1840m_(e))`
`lamda_(e)=lamda_(n)` or `h/(mx)=h/(1840mv)`
or `v=x//1840`


Discussion

No Comment Found

Related InterviewSolutions