If the radius of the first orbit of hydrogen atom is $\alpha_{0}$, then de Broglie's wavelength of electron in $3^{\text {rd }}$ orbit is :

Question

$\frac{\pi \alpha^{3}}{6}$

$3\pi\alpha_0$

$6\pi\alpha_0$

$\frac{\pi \alpha^{3}}{3}$

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