Find the expression of radius of an orbit of electron in terms of nucleus charge `Q_2`, tangential velocity v and mass of electron `m_e` ?

In an atom the ratio of radius of orbit of electron to the radius of nucleus is

In an atom the ratio of radius of orbit of electron to the radius of nucleus is

An electron of charge e moves in a circular orbit of radius r round a nucleus the magnetic field due to orbit motion off the electron at the site of the nucleus is B . The angular velocity omega of the electron is

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

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

If the radius of an orbit is r and the velocity of electron in it is v , then the frequency of electron in the orbit will be