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Question

The wavelength of β-line of the Balmer series is 4815oA . What is the wavelength of α-line of the Balmer series of the same atom?

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Solution

The wavelength of the visible line in blue- green region corresponds to Hβ, the balmer's formula is,
1λ=R(1221n2)
R=Rydberg's constant=1.097×107m1
For Hβ n=3
1λ=1.097×107m1(1419)
λ=4.9×107m
λ=4900oA

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