One of the lines in the emission spectrum of `Li^(2 +)` has the same wavelength as that of the second line of Balmer series in hydrogen spectrum. The electronic transition correspnding to this line is.

Options

A. `n = 4 to n = 2`
B. `n = 8 to n = 2`
C. `n = 8 to n = 4`
D. `n = 12 to n = 6`

Answer

D

Explanation

For second line of Balmer series in hydrogen spectrum, correspondins to `4 to 2` transition of hydrogen atom .
It is equivalent to `4 xx 3 to 2 xx 3 i.e. 12 to 6` transition of `Li^(+ +)`