Question

A gas of hydrogen-like ions is prepared in a particular excited state A. It emits photons having wavelength equal to the wavelength

Answer 1

a) The gas emits 6 wavelengths, let it be in nth excited state.

=> n(n-1)/2=6=>n=4

So,  The gas is in 4th excited state.

b) Total no.of wavelengths in the transition is 6. We have  n(n-1)/2=6 =>n=4.