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In terms of Rydberg's constant R, the wa...

In terms of Rydberg's constant `R`, the wave number of the first Balman line is

A

`(3R)/(5)`

B

`(7R)/(25)`

C

`(21R)/(50)`

D

`(21R)/(100)`

Text Solution

Verified by Experts

The correct Answer is:
D
For `H_lamda " line " n_i =2, n_f = 5`
`1/lamda = R [1/2^2 - 1/5^2] = R [1/4 - 1/25] = (21R)/(100)`
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