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Scorching goIITian

Joined:	18 Feb 2008
Post:	221

3 Apr 2008 19:31:43 IST

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solve it

None

Using the Rydberg formula, calculate the wavelengths of the first four spectral lines in the Balmer series of the hydrogen spectrum.
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Chirag Sangani

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Joined: 12 Dec 2007

Posts: 611

3 Apr 2008 20:43:56 IST

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Balmer series is obtained by transition of electrons from higher states to the 1st excited state (i.e. n=2). It is necessary that the initial state be greater than 2. So for the first 4 lines, we have n=3,4,5,6. By Rydberg's formula,

1/

= R_H (1/2²- 1/n²) * z²
Where
R_H = Rydberg Constant
n = 3,4,5,6
z = Atomic No. of H-like species

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