Question

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

Options

• 3 R

• 2.25 R

• 9 R

• `"R"/3`

Answer 1

The radius of the electron's second stationary orbit in Bohr's atom is R. The radius of the third orbit will be 2.25 R.

Explanation:

`"r"_"n" ∝ "n"^2 ⇒ "r"_2/"r"_3 = 4/9 ⇒ "r"_3 = 9/4"R" = 2.25`R