Question

The frequency of the first line in Lyman series in the hydrogen spectrum is $v$. What is the frequency of the corresponding line in the spectrum of doubly ionized Lithium?

• A. $v$
• B. $3v$
• C. $9v$
• D. $27v$

Answer 1

The correct option is C $9v$

We know that, frequency, $v\propto Z^2$
For a doubly ionized lithium, Z = 3
$\therefore$ Frequency of the corresponding line in the spectrum of doubly ionized Lithium, $v^{\prime }=3^{2}v=9v$
Hence, the correct choice is (c).