Question

Q475) What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n=2 in the He+ spectrum [ IIT 1993]

Q475) What transition in the hydrogen spectrum would have the same wavelength as the Balmer transition n=4 to n=2 in the He+ spectrum [ IIT 1993]

SOLUTION

Wave number of Hydrogen=wave number for He+

Answer:(d)