Consider an electron in a hydrogen atom revolving in its second excited state (having radius 4.65 $\mathop A\limits^o $). The
de-Broglie wavelength of this electron is :
6.6 $\mathop A\limits^o $
3.5 $\mathop A\limits^o $
9.7 $\mathop A\limits^o $
12.9 $\mathop A\limits^o $
Solution
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