Calculate the velocity of an electron in the first Bohr orbit of a hydrogen atom

What is the velocity of electrons in'the first Bohr Orbit of Hydrogen atom:

Calculate the energy of an electron in the first Bohr orbit of He^(+) .

Calculate the energy of an electron in the first Bohr orbit of He^(+) .

Calculate the energy of an electron in the first Bohr orbit of He^(+) .

Calculate the velocity of electron in Bohr's first orbit of hydrogen atom. How many times does the electron go in Bohr's first orbit in one second ?