Question

If radius of first Bohr's orbit of H -atom is $\mathrm{a}_{0}$. Then find the radius of $2^{\text {nd }}$ Bohr's orbit of H -atom.

• A. $8 a_{0}$
• B. $4 a_{0}$
• C. $a_{0}$
• D. $6 \pi a_{0}$

Answer 1

Answer: (B)

$4 a_{0}$

Answer 2

As $r \, ??n^2,$ therefore, radius of 2$^nd$ Bohr's orbit = 4a$_0$