Explanation

(d) Minimum wavelength is for highest energy
$n = 1 \rightarrow n = \infty$, energy $= E_{0}$
$n = 2 \rightarrow n = \infty$, energy $= E_{0}/4$
[image:13_image26.emf]
$\therefore$ Balmer line has 4 times the wavelength
$\therefore$ Ratio of minimum wavelength is $1/4 = 0.25$