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  4. In a sample of H-atom, electrons make transition from fifth excited state to ground state, producing all possible types of photons, then the number of lines in infrared region is

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Q. In a sample of $H$-atom, electrons make transition from fifth excited state to ground state, producing all possible types of photons, then the number of lines in infrared region is

Structure of Atom

Solution:

image
Maximum number of lines produced $=\frac{6(6-1)}{2}=15$
Out of these $15$ lines, $5$ lines belong to ultraviolet region and $4$ lines are in visible region and rest are in infrared region