When an electron in a hydrogen atom jumps to the innermost orbit,the radiation emitted belongs to which one of the following series?

In the given figure,the energy levels of a hydrogen atom have been shown along with some transitions marked $A, B, C, D$ and $E$. The transitions $A, B$ and $C$ respectively represent:

In hydrogen atom spectra,if the ratio of wavelengths corresponding to the first line of the Lyman series and the first line of the Balmer series is $9 \alpha$,the value of $\alpha$ is

The spectral series of the hydrogen spectrum that lies in the ultraviolet region is the

The first member of the Balmer series of a hydrogen atom has a wavelength of $6561 \; \mathring{A}$. The wavelength of the second member of the Balmer series (in $nm$) is

If the wavelengths of the first Lyman line for Hydrogen,$He^+$,and $Li^{2+}$ ions are $\lambda_1$,$\lambda_2$,and $\lambda_3$ respectively,then the ratio of these wavelengths is: