There are two samples of H and He + atom. Both are in some excited state. In hydrogen atom total number of lines observed in Balmer series is 4 and in He + atom total number of lines observed in paschen series is 1. Electron in hydrogen sample make transitions to lower states from its excited state, then the photon corresponding to the line of maximum energy line of Balmer series of H sample is used to further excite the already excited He + sample. Then maximum excitation level of He + sample will be :
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In H -atom, 4 lines are observed in Balmer series. So, electron is in 
. In 
ion, one lines is observed in Paschen series. So electron is in 
.
electron in 
will jump from 
ton 
.
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