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Old Sep 5th 2011, 08:56 PM   #1
s3a
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Question on electron going from state 4 to ground state

For question 1.32 of the attached pdf, I don't get how "there are six distinct steps that can be taken." Could someone please tell me what those are? I count 8 but I don't think I'm doing it correctly.

Any help would be greatly appreciated!
Thanks in advance!
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File Type: pdf Q1.32.pdf (76.7 KB, 3 views)
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Old Sep 6th 2011, 04:45 AM   #2
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Hi

Consider it this way, how many possible emissions can we have?

4 to ground
4 to 2
4 to 3
3 to ground
3 to 2
2 to ground

if you count the above, there is 6.
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Old Sep 6th 2011, 09:29 AM   #3
s3a
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I get it now, thanks!
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Old Oct 9th 2011, 12:44 AM   #4
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To generalize, if there are n levels, the number of transitions would be nC2 i.e. a combination of n taken 2 at a time. In actual practice, some transitions may be forbidden however.
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