Question

The radius of an electron in second stationary orbit in Bohr's atom is $R$ . The radius of the third orbit will be

• A. $3R$
• B. $2.25R$
• C. $9R$
• D. $\frac{R}{3}$

Answer 1

Answer: (B)

$r=0.529\frac{n^2}{Z}$
$R=\frac{0.529\times 4}{Z}$
$R^{\prime }=\frac{0.529\times 9}{Z}$
$\frac{R\prime }{R}=\frac{9}{4}$