Question

In an atom an electron excites to the fourth orbit. When it jumps back to the energy levels a spectrum is formed.Total number of spectral lines in this spectrum would be

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is D 6

In an atom an electron excites to the fourth orbit, $n=4$

The total number off spectral lines in the spectrum is,

$\frac{n(n-1)}{2}=\frac{4(4-1)}{2}=\frac{4\times 3}{2}=6$

The correct option is D.