1. Consider \(3^{rd}\) orbit of \(\text{He}^+\) (Helium), using non-relativistic approach, the speed of electron in this orbit will be (given \(\text{K}\, =\,9 \times 10^9\) constant, \(\text{Z}\,=\,2\) and \(\text{h (Planck's constant)}\,=\,6.6 \times 10^{-34}Js\)