Question

According to Bohr’s theory, the angular momentum for an electron in $5th$ orbit is

• A. $2.5\, h/ \pi$
• B. $5\, h/ \pi$
• C. $25\, h/ \pi$
• D. $5\, \pi/ 2 \pi$

Answer 1

Answer: (A)

According to Bohr's theory,

angular momentum, $m v r=\frac{n h}{2 \pi}$

For 5 th orbit, $n=5$

$\therefore$ Angular momentum

$=\frac{5 h}{2 \pi}=2.5 \frac{h}{\pi}$