# Hydrogen atom in its ground is excited by means of monochromatic radiation of wavelength 975 Å. How many different lines are possible in the resulting spectrum ? Calculate the longest wavelength amongst them. You may assume the ionization energy for hydrogen atom as 13.6 eV.

Rinkoo Gupta
. $\frac{238}{92}$U ⟶ $\frac{234}{90}$X + $\frac{4}{2}$He $\frac{234}{91}$X ⟶ $\frac{234}{90}$Y + $\frac{0}{-1}$e