# In a sample of H-atom electrons make transition from 5th excited state upto ground state, producing all possible types of photons, then find out the number of lines in Infrared region?

Jun 6, 2018

$6$

#### Explanation:

${5}^{\text{th}}$ excited state$= {6}^{\text{th}}$ shell

All types of transitions in $\text{IR}$ region are

$1. 6 \to 5 \textcolor{w h i t e}{\ldots \ldots} 4. 5 \to 4$
$2. 6 \to 4 \textcolor{w h i t e}{\ldots \ldots} 5. 5 \to 3$
$3. 6 \to 3 \textcolor{w h i t e}{\ldots \ldots} 6. 4 \to 3$

Number of lines in infrared region are $6$