Orbital period or revolution frequency of the electron in a Bohr orbit (expression)

1. A.
   $\frac{4\varepsilon_0 n h^3}{m e^2}$
2. B.
   $\frac{4\varepsilon_0 n^2 h^2}{m e^2}$
3. C.
   $\frac{4\varepsilon_0^2 n^3 h^3}{m e^4}$
4. D.
   $\frac{4\varepsilon_0^2 n^2 h^3}{m e^3}$

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1. A.
   $\frac{2\varepsilon_0^2 n^2 h^2}{me^4}$
2. B.
   $\frac{4\varepsilon_0^2 n^2 h^2}{me^2}$
3. C.
   $\frac{4\varepsilon_0^2 n^3 h^3}{me^4}$
4. D.
   $\frac{4\varepsilon_0 n^2 h^2}{\pi me^2}$

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1. A.
   $h/4\pi^2mr^2$
2. B.
   $h/4\pi^2mr$
3. C.
   $h/4\pi mr$
4. D.
   $h/4\pi^2m^2r^2$

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1. A.
   $\dfrac{4\epsilon_0^2n^3h^3}{me^4}$
2. B.
   $\dfrac{2\epsilon_0^2n^2h^3}{me^2}$
3. C.
   $\dfrac{4\epsilon_0^2n^2h^3}{me^2}$
4. D.
   $\dfrac{2\epsilon_0n^3h^3}{me^4}$

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