Question

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

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

Answer 1

Answer: (A)

According to Bohr's theory,

angular momentum, $mvr=\frac{nh}{2\pi }$

For 5 th orbit, $n=5$

$\therefore$ Angular momentum

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