Q18. The ratio of the shortest wavelength of Balmer series to the shortest wavelength of Lyman series for hydrogen atom is : (1) $4 : 1$ (2) $1 : 4$ (3) $2 : 1$ (4) $1 : 2$
Q18. The ratio of the shortest wavelength of Balmer series to the shortest wavelength of Lyman series for hydrogen atom is :\\
(1) $4 : 1$\\
(2) $1 : 4$\\
(3) $2 : 1$\\
(4) $1 : 2$