Question

In a sample ,electron jumps from $5^{th}$ excited state to ground state then number of spectral lines in visible range will be:

• A. $4$
• B. $3$
• C. $2$
• D. $5$

Answer 1

The correct option is A $4$

No. of lines $=\sum (n_2-n_1)$

$=\sum (6-2)$

$=\sum 4$

$=\sum \underset{\text{Balmer}}{4},\underset{\text{Paschen}}{3},\underset{\text{Brackett}}{2},\underset{\text{Lymann}}{1}=10$

No. of spectral lines in Balmer series will be in visible range.

Hence no. of spectral lines in visible range will be $4$.

Solution:- (A) $4$ is correct