Question

The ratio of velocity of electron in second orbit of $H{e}^{+}$ to third orbit of $B^{+4}$ is:-

• A. $\frac{5}{3}$
  
• B. $\frac{3}{5}$
  
• C. $\frac{3}{2}$
  
• D. $\frac{2}{3}$

Answer 1

The correct option is B $\frac{3}{5}$


$V_n\propto \frac{z}{n}\frac{V_{H{e}^{+}}}{V_{B^{+4}}}=\frac{\frac{2}{2}}{\frac{5}{3}}=\frac{2}{5}$