The frequency of 1st line Balmer series in `H_(2)` atom is `v_(0)`. The frequency of line emitted by single ionised He atom is

Options

A. `2f_(0)`
B. `4f_(0)`
C. `f_(0)//2`
D. `f_(0)//4`

Answer

B

Explanation

`f prop Z^(2) rArr (f_(H_(2)))/(f_(He)) = ((1)^(2))/((2)^(2))= (1)/(4)`
`f_(He) = 4f_(H_(2)) = 4 f_(0)`