Q. In Bohr’s model, if the atomic radius of the first orbit is $r_{0}$, then the radius of the fourth orbit is
A) $r_{0}$
B) $4r_{0}$
C) $r_{0}/16$
D) $16r_{0}$
Explanation
(d) $r_{n} \propto n^{2} \Rightarrow \frac{r_{4}}{r_{1}} = \left( \frac{4}{1} \right)^{2} = \frac{16}{1} \Rightarrow r_{4} = 16\ r_{1} \Rightarrow r_{4} = 16\ r_{0}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.