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Question

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

A
15
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B
6
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C
21
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Solution

The correct option is A 15
The number of lines produced when an electron from the nth shell drops to the ground state is n(n1)2

So the required number of emission lines is 6(61)2=15

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