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Balmer gave an equation for wavelegth of...

Balmer gave an equation for wavelegth of visible region of H-spectrum as `lambda=(Kn^(2))/(n^(2)-4).
Where n= pricipal quantum number of energy level, K=constant in terms of R (Rydberg constant).
The value of K in term of R is :

A

R

B

`R/2`

C

`4/R`

D

`5/R`

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