Question

The maximum number of spectral lines observed when electron jumps from the 4^th excited state to the ground state of hydrogen atoms? 

(1) 6 

(2) 3 

(3) 10 

(4) 2

Answer 1

Correct option is: (3) 10 

\(\frac{(n_2 - n_1) (n_2 - n_1 + 1)}{2}\)

\(=\frac{(5-1) (5-1+1)}{2}\)

\(= \frac{20}{2}\)

= 10