Answer :

Radiation coming from change in transition state of hydrogen atom



Now we have to check transition possible for n=1 and n=2 states separately.


From n = 1 to 2 for helium ions(Z=2).



It is not possible as it is greater than E.


From n=1 to 3



It is also not possible.


Now as we can see energy is increasing (E2>E1) we can say that no transition is possible from n=1.


From n=2 to 3



This is possible as E3<E.


From n=2 to 4



It is also possible as E4=E.


Now as energy reached maximum limit so no further transition changes is possible.


Hence E3(n=2 to 3) and E4(n=2 to 4) are only possible transition change.


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