If $R$ is the Rydberg constant in $cm^{-1}$,then the hydrogen atom does not emit any radiation of wavelength in the range of

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

Taking the wavelength of the first Balmer line in the hydrogen spectrum ($n = 3$ to $n = 2$) as $660\,nm$,the wavelength of the $2^{nd}$ Balmer line ($n = 4$ to $n = 2$) will be....$nm$.

At room temperature, gaseous hydrogen is bombarded with a beam of electrons of $13.6 \ eV$ energy. The series to which the emitted spectral line belongs is:

If the longest wavelength in the ultraviolet region of the hydrogen spectrum is $\lambda_{0}$,then the shortest wavelength in its infrared region is:

The wavelength of the Lyman series is given by which of the following expressions?