Question

Two electrons revolving around a nucleus at distance 'r' and '4r'. The ratio of their time period is

• A. 1 : 4
• B. 4 : 1
• C. 8: 1
• D. 1 : 8

Answer 1

Answer: (D)

$T^2\propto r^3$
$\frac{T_r}{T_{4r}}={\left(\frac{r}{4r}\right)}^{3/2}$
$=\frac{1}{8}$