Electron Orbits

Are the electrons orbits equally spaced ?

For the electron to revolve round the nucleus without radiating energy in the orbit, the electron orbit should be

The ratio of the radius of the Bohr orbit for the electron orbiting the hydrogen nucleus that of the electron orbiting the deuterium nucleus is approximately

The ratio of the radius of the Bohr orbit for the electron orbiting the hydrogen nucleus that of the electron orbiting the deuterium nucleus is approximately

The area of the electron orbit for the ground state of hydrogen atom is A. What will be the area of the electron orbit corresponding to the second excited state?

The area of the electron orbit for the ground state of hydrogen atom is A.What will be the area of the electron orbit corresponding to the first excited state ?

The ratio of the radius of the first Bohr orbit for the electron orbiting the hydrogen nucleus to that of the electron orbiting the deuterium nucleus (mass nearly twice that of the hydrogen nucleus) is approximately

The ratio of the radius of Bohr first orbit for the electron orbiting the hydrogen nucleus to that of the electron orbiting the deuterium nucleus (mass nearly twice that of H nucleus) is approximately