Which of the following spectral series of the hydrogen atom lies in the visible range of the electromagnetic spectrum?

The transition from the state $n = 3$ to $n = 1$ in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

In a hydrogen atom spectrum,when an electron jumps from the second excited state to the first excited state,the wavelength of radiation emitted is $\lambda$. If the electron jumps from the third excited state to the second orbit,the wavelength of radiation emitted will be $20 \lambda / x$. The value of $x$ is

For a hydrogen atom,the ratio of the largest wavelength of the Lyman series to that of the Balmer series is:

The ratio of the longest to shortest wavelengths in the Brackett series of hydrogen spectra is

Ratio of the wavelengths of the first line of the Lyman series and the first line of the Balmer series is