The velocity of electron in the first Bohr orbit of hydrogen atom would be (radius of the first orbit given as 0.53 `xx` 10-10 m)
4.4 `xx` 106ms-1
3.3 `xx` 106s-1
2.2 `xx` 106 cms-1
1.1 `xx` 106s-1
i think (C) is correct