MCQ
If the radius of the $3^{\text {rd }}$ Bohr's orbit of hydrogen atom is $r_{3}$ and the radius of $4^{\text {th }}$ Bohr's orbit is $r_{4}$. Then ....
- A$r _{4}=\frac{9}{16} r_{3}$
- ✓$r_{4}=\frac{16}{9} r_{3}$
- C$r_{4}=\frac{3}{4} r_{3}$
- D$r_{4}=\frac{4}{3} r_{3}$