MCQ
If the speed of electron in the Bohr's first orbit of hydrogen atom is $x$, the speed of the electron in the third Bohr's orbit is
- A$x/9$
- ✓$x/3$
- C$3x$
- D$9x$
✓
Answer
Correct option: B.
$x/3$
b
$since,{v}=2.18 \times 10^{6} \times \frac{\mathrm{Z}}{\mathrm{n}} \,\mathrm{m} / \mathrm{s}$
$since,{v}=2.18 \times 10^{6} \times \frac{\mathrm{Z}}{\mathrm{n}} \,\mathrm{m} / \mathrm{s}$
$\text { in first orbit, } \mathrm{v}=2.18 \times 10^{6} \times \frac{1}{1}=\mathrm{x}$
$\text { in third orbit, } \mathrm{v}=2.18 \times 10^{6} \times \frac{1}{3}=\frac{\mathrm{x}}{3}$
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