de Broglie wavelength of the electron in the nth Bohr orbit of hydrogen in terms of a0

1. A.
   $\frac{\pi a_{0}}{6}$
2. B.
   $\frac{\pi a_{0}}{3}$
3. C.
   $6\pi a_{0}$
4. D.
   $3\pi a_{0}$

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1. A.
   $\frac{2a_{0}}{n\pi}$
2. B.
   $\frac{8\pi a_{0}}{n}$
3. C.
   $\frac{4\pi a_{0}}{n}$
4. D.
   $\frac{4n}{\pi a_{0}}$

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