Q.

What is the maximum no. of emission lines obtained when the excited electrons of a hydrogen atom in n = 5 drop to ground state

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a

10

b

5

c

12

d

15

answer is A.

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Detailed Solution

Number of emission lines in the spectrum will be equalto n2−n1n2−n1+12 where n2=5 and n1=1.∴(5−1)(5−1+1)2=202=10 lines.
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What is the maximum no. of emission lines obtained when the excited electrons of a hydrogen atom in n = 5 drop to ground state