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Assuming Rydberg constant (R(H)) to be 1...

Assuming Rydberg constant `(R_(H))` to be 109670 c`m^(- 1)`, the longest wavelength line in the Lyman series of the hydrogen spectrum is

A

`1215.8Å`

B

`1025.8Å`

C

`972.6Å`

D

`949.8Å`

Text Solution

Verified by Experts

Longest wavelength means smallest wave number. In Lyman series, it is for jump from `n_(2) = 2` to `n_(1) = 1`
i.e., `barv=109670(1/(1^(2))-1/(2^(2)))=109670xx3/4=82252.5cm^(-1)`
`lamda=1/v=1/(82252.5cm^(-1))`
`=1215.8xx10^(8)cm=1215.8 Å`
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