Velocity of electron in the first orbit of H-atom as compared to that of velocity of light is approximately

The velocity of electron in first orbit of H-atom as compared to the velocity of light is

Velocity of the electron in the 1^(st) Bohr orbit of H-atom is

The velocity of the electron in the first Bohr orbit as compared to that of light is about

The velocity of an electron in the first orbit of H-atom is v. The velocity of an electron in the 2nd orbit

The velocity of an electron in the first orbit of H atom is v . The velocity of an electron in the second orbit of He^(+) is

The velocity of an electron in the first orbit of H atom is v . The velocity of an electron in the second orbit of He^(+) is