Hydrogen emission Spectrum

Which of the following transitions are not allowed in the normal electronic emission spectrum of an atom?

How many spectral series appear in the emission spectrum of atomic hydrogen?

The electron in hydrogen atom in a sample is in n^(th) excited state, then the number of differrent spectrum lines obtained in its emission spectrum will be

The wave number of the spectral line in the emission spectrum of hydrogen will be equal to (8)/(9) times the Rydberg's constant if the electron jumps from …………..:-

In photons of energy 12.75 eV are passing through hydrogen gas in ground state then no. of lines in emission spectrum will be

The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is

Some of the wavelength observed in the emission spectrum of neutral hydrogen gas are 912, 1026, 1216, 3646, 6563 Å . If broad band light is passing through neutral hydrogen gas at room temperature, the wavelength that will not be absorbed strongly is