The acceleration of an electron in the first orbit of the hydrogen atom (n = 1) is :

Question

${{{h^2}} \over {{\pi ^2}{m^2}{r^3}}}$

${{{h^2}} \over {{8\pi ^2}{m^2}{r^3}}}$

${{{h^2}} \over {{4\pi ^2}{m^2}{r^3}}}$

${{{h^2}} \over {{4\pi }{m^2}{r^3}}}$

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