Question

If the radius of first Bohr orbit of H atom is 0.53 $\dot{A}$, the radius of third orbit is:

• A. $1.59A^o$
• B. $0.14A^o$
• C. $0.53A^o$
• D. $4.77A^o$

Answer 1

The correct option is D $4.77A^o$

Formula for Bohr's radius,

$r_n=n^2{r}_1$

$r_3=3^2\times 0.53=4.77A^o$