The ratio of the wavelengths of radiation emitted when an electron in the hydrogen atom jumps from the $4^{th}$ orbit to the $2^{nd}$ orbit and from the $3^{rd}$ orbit to the $2^{nd}$ orbit is:

The ratio of maximum to minimum wavelength in the Balmer series of the hydrogen atom is

In the hydrogen atom spectrum, ($R$ is Rydberg's constant):
$A$. The maximum wavelength of the radiation of the Lyman series is $\frac{4}{3R}$.
$B$. The Balmer series lies in the visible region of the spectrum.
$C$. The minimum wavelength of the radiation of the Paschen series is $\frac{9}{R}$.
$D$. The minimum wavelength of the Lyman series is $\frac{5}{4R}$.
Choose the correct answer from the options given below:

Whenever a hydrogen atom emits a photon in the Balmer series,

Which of the following spectral series of the hydrogen atom lies entirely in the ultraviolet region?

The ratio of wavelengths of the last line of the Balmer series and the last line of the Lyman series is