MCQ
If electron moves from an excited state to ground state in multistep in hydrogen spectrum lines in visible region are $4$. Then number of lines in infra red region is
- A$4$
- ✓$6$
- C$5$
- D$7$
✓
Answer
Correct option: B.
$6$
b
$\mathop {\mathop 4\limits_ \downarrow }\limits_{Balmer} + \mathop {\mathop 3\limits^ \uparrow }\limits^{Paschen} + \mathop {\mathop 2\limits_ \downarrow }\limits_{Brackett} + \mathop {\mathop 1\limits_ \downarrow }\limits_{P\,fund} $
$\mathop {\mathop 4\limits_ \downarrow }\limits_{Balmer} + \mathop {\mathop 3\limits^ \uparrow }\limits^{Paschen} + \mathop {\mathop 2\limits_ \downarrow }\limits_{Brackett} + \mathop {\mathop 1\limits_ \downarrow }\limits_{P\,fund} $
total lines in $IR$ region $=3+2+1=6$
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