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Question

Atomic hydrogen is excited to the nth energy level.The maximum number of spectral lines which it can emit while returing to the ground state, is
  1. 12n(n+1)
  2. 12n(n1)
  3. n(n1)
  4. n(n+1)

A
12n(n1)
B
12n(n+1)
C
n(n1)
D
n(n+1)
Solution
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Maximum no of spectral lines =n(n1)2

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