Question

20. In and 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 relation to find number of spectral lines is \(\frac{(n_2-n_1)(n_2-n_1+1)}{2}\)

Here transition is from n = 4 to n = 1

So, number of spectral lines =  \(\frac{3\times 4}{2}=6\)

Hence, there are 6 spectral lines.

Comments

Wrong answer