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Question

What is the maximum number of emission lines obtained when the excited electron of a H atom in n= 5 drops to the ground state?

A
12
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B
15
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C
21
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D
10
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Solution

The correct option is D 10
Maximum number of emission lines from nth energy state to ground state is given by:
=n(n1)2=5(51)2=202=10 lines.
option D

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