Answer to Question #84792 in Physical Chemistry for Anuj

Question

For the first two lines of Paschen series, identify the value of n1 and n2.
Calculate the wave number values for these lines.

Answer 1

Paschen series:

n1 = 3 , n2 = 4 , 5 , 6 , . . . . .

The wave number of these spectral lines could be calculated by the given equation :

⊽ = 1 / λ = R {( 1 / n1 ² ) - (1 / n2 ² )}

The Paschen series in near IR region can be calculated by following formula :

⊽ = R [ 1 / 3 ^ 2 - 1 / n2 ^ 2 ]