In H-atom, the electron in one of the orbit has a potential energy of -1.70ev. Then which among the following are correct

Energy of an ${\mathrm{e}}^{-}$ in nth bohr orbit is $-13.6\mathrm{ev}/{\mathrm{n}}^2$ Hence for 4^th orbit

$=-13.6/16=-0.85\mathrm{ev}\to \mathrm{T}.\mathrm{E}\text{ its }\mathrm{K}.\mathrm{E}=+0.85\mathrm{ev}\Rightarrow \mathrm{PE}=-1.70\mathrm{ev}$

(i) Velocity of ${\mathrm{e}}^{-}\text{in }{4}^{\mathrm{th}}$ Bohr orbit of H-atom $=\frac{2180}{4}\mathrm{km}/\sec =545\mathrm{km}/\sec$

(ii) Radius of 4^th Bohr orbit of H-atom is $0.0529\times 16\mathrm{nm}=0.0529\times \mathrm{nm}=0.84\mathrm{nm}$