If the radius of first Bohr orbit be `a_0`, then the radius of the third orbit would be-

Options

A. `3 xx a_(0)`
B. `6 xx a_(0)`
C. `9 xx a_(0)`
D. `1//9 xx a_(0)`

Answer

C

Explanation

Radius of Bohr orbit `= (n^(2))/(Z) xx a_(0)`.
`= ((3)^(2))/(1) xx a_(0) = 9 a_(0)`.