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What is the maximum number of emission l...

What is the maximum number of emission lines when the excited electron of a H atom in n=6 drops to the ground state?

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The number of lines produced in a spectrum when an electron returns from nth energy state to the ground state `=sum(n_(2)-n_(1))=sum(6-1)=sum(5)=5+4+3+2+1=15`.
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