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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