Problem 2: What is the wavelength of 2nd line of Paschen series?
Solution
In case of Paschen series, the transition of electrons takes place in the 3rd energy level from the higher orbits.
The general equation of hydrogen spectrum,
For Paschen series, P = 3 and the Rydberg’s constant R = 1.0973732 × 107 m-1. The second line means the transition from the 5th energy state; the first line comes from transition from the 4th level. Put the values,
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