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The acceleration of electron in the first orbit of hydrogen atom is:

A. $\frac{4 π^{2} m}{h^{3}}$

B. $\frac{h^{2}}{4 π^{2} mr}$

C. $\frac{h^{2}}{4 π^{2} m^{2} r^{3}}$

D. $\frac{m^{2} h^{2}}{4 π^{2} r^{3}}$

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Correct Answer : C.

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