1.

Given the value of Rydberg constant is 10^(7) m^(-1) the wave number of the last line of the Balmer series in hydrogen spectrum will be

Answer»

`0.5xx10^(7)m^(-1)`
`0.25xx10^(7)m^(-1)`
`2.5xx10^(7)m^(-1)`
`0.025xx10^(7)m^(-1)`

Solution :For Balmer series
`(1)/(LAMBDA)=R[(1)/(2^(2))-(1)/(OO^(2))]` For final line` n=oo`
`(1)/(lambda)=(R)/(4)=(10^(7))/(4)`
`:.(1)/(lambda)=0.25xx10^(7)m^(-1)`
`:.` Wave number `0.25xx10^(7)m^(-1)`


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