To which Bohr's orbit in hydrogen atom, the electric transition corresponds to third line in the Balmer series?

In the given figure for the stationary orbits of the hydrogen atom, mark the transitions representing the Balmer and Lyman series.

State Bohr’s postulates for hydrogen atom.

In which series of hydrogen spectra, the transition involves largest change of energy?

The limiting line in Paschen series corresponds to

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10^ -40 . An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.

If a_(0) be the radius of first Bohr's orbit of H-atom, the de-Broglie's wavelength of an electron revolving in the second Bohr's orbit will be:

Calculate the frequency of rtevolution of electron in the first Bohr orbit of hydrogen atom,if the radius of the first Bohr orbit is 0.5 overset @A and the velocity of electron in the first orbit is 2.24 xx 10^6 m s^(-1) .

The energy of the second Bohr orbit in the hydrogen atom is -3.41eV. The energy of the second Bohr orbit of He^(+) ion would be :

Why the properties of the third transition series are very similar to the second transition series?