# NEET Physics Atoms Questions Solved

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If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr's first postulate, the kinetic energy $\mathrm{K}=\frac{1}{2}{\mathrm{mv}}^{2}$ of the electron in C.G.S. system is equal to

(a) $\frac{1}{2}\frac{{\mathrm{Ze}}^{2}}{\mathrm{r}}$                             (b) $\frac{1}{2}\frac{{\mathrm{Ze}}^{2}}{{\mathrm{r}}^{2}}$
(c) $\frac{{\mathrm{Ze}}^{2}}{\mathrm{r}}$                                 (d) $\frac{{\mathrm{Ze}}^{2}}{{\mathrm{r}}^{2}}$

(a) In the revolution of electron, coulomb force provides the necessary centripetal force

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