Question

The angular momentum of an electron in first excited state of hydrogen atom is

• A. $3\hslash$
• B. $2\hslash$
• C. $\frac{\hslash }{2}$
  
• D. $\hslash$

Answer 1

The correct option is B $2\hslash$

Answer (4)
$m_{e}vr=n\hslash \cdot ,wheren=1,2,3$
$\hslash =\frac{\hslash }{2\pi }$
for first excited state, $n=2$
$\therefore m_{e}vr=2\hslash$