1) According to Bohr's theory , the angular momentum for an electron of 3rd orbit is A) 3h B) 15h C) 9h D) $2 \frac{h}{\pi}$ Answer: Option AExplanation:Angular momentum ,mvr =$\frac{nh}{2\pi}=\frac{3 \times h}{2\pi}=\frac{1.5 h}{\pi}$ $=3h$ $[ \because h=\frac{h}{2\pi}]$
