how many spectral lines are seen for hydrogen atom when electron jump from n2=5 and n1=1  in visible region??
 

Asked by Sayoni Maiti | 23rd May, 2014, 10:07: PM

Expert Answer:

If the electron jumps from n2 = 5 to n1 = 1 then following are the transitions possible.

  1. 5→ 4
  2. 5→ 3
  3. 5→ 2
  4. 5 → 1
  5. 4 → 3
  6. 4→ 2
  7. 4→ 1
  8. 3 → 2
  9. 3→ 1
  10. 2 → 1

Hence there are 10 transitions and hence 10 spectral lines possible.

The general formula for the number of spectral lines emitted is

N = (n2 – n1) (n2 – n1 + 1)

2

So N = ( 5 - 1) ( 5 - 1 + 1 ) = 4 X 5 = 10

2 2

Answered by Vaibhav Chavan | 28th May, 2014, 10:25: AM

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