Q177 / 180 · COMEDK 2016 · Physics

Moment of momentum of an electron revolving in second Bohr orbit of hydrogen is

  • A
    $2 \pi h$
  • B
    $h / 2 \pi$
  • Correct answer
    C
    $h / \pi$
  • D
    $2 h / 3 \pi$

Solution

Moment of momentum of an electron in $n$th orbit is given by $L=\frac{n h}{2 \pi}$ For an electron in second Bohr orbit, $n=2$ $\therefore \quad L=\frac{2 h}{2 \pi}=\frac{h}{\pi}$

Hence, the correct answer is option: 'C'.

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