A) \[7h\]
B) \[42h\]
C) \[\sqrt{7}h\]
D) \[\sqrt{56}h\]
Correct Answer: A
Solution :
Angular momentum of electron \[\begin{align} & =n\frac{h}{2\pi }=nh \\ & =7h\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(n=7) \\ \end{align}\]
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