What is the ratio of the speeds of an electron in the first and second orbits of a hydrogen atom?

What is the ratio of the areas of the first and the second orbits of an hydrogen atom?

Show that the speed of electron in the second orbit of He^(+) atom is equal to the speed of electron in the first orbit of hydrogen atom.

Find the angular speed of the electron in the first orbit of hydrogen atom.

The angular speed of the electron in the first orbit in a hydrogen atom is

Ratio of time period of electron in first and second orbit of H-atom would be -

The energy of an electron revolving in the first orbit of hydrogen atom is

According to Bohr's model , the ratio of the energies of the electron in the first orbit of hydrogen atom and He^(+) atom is

The ratio of the speed of an electron in the first orbit of hydrogen atom to that in the first orbit of He is

The ratio of the speed of an electron in the first orbit of hydrogen atom to that in the first orbit of He is