Question

Q37 Find the wavelength for a- line of the Pfund series for H-atom?​

Answer 1

Answer:

$556 \times \frac{3}{35} 6$

Answer 2

A series of wavenumber in the Pfund series of the Hydrogen spectrum is given by RH[1/5^2-1/n^2], where RH is the Rydberg constant for hydrogen and n is an integer greater than 5.

Now, first spectral line n = 6. Thus,

1/λ = RH [1/5^2 - 1/6^2] = RH [1/25 - 1/36] = 11RH/900.

Hence the wavelength for a- line of the Pfund series for H-atom is 11RH/900.