Match the following :
B.E.-Binding energy
I.E.-Ionization energy
`{:("Column-I","Column-II"),((A)"B.E. of"He^(+)"atom in an excited state" ,(p)"Infrared region"),((B)7to3"transition in H atom",(q)"3.4 ev"),((C )5to1 "transition in H-atom",(r)"13.6 ev"),((D)"series limit of Balmer series in H-atom",(s) "10 Spectral lines observed"),(,(t)"Ultra violet region"):}`

Answer

A-q,r ; B-p,s ; C-p,s,t ; D-q

Explanation

(A)B.E. of `He^+` atom =`(13.6xx2^2)/n^2` n=1,2,3…
Hence it can be 13.6 ev , 3.4 ev both
( B)In `7to3` transition `Deltan=7-3=4`
`:.` maximum number of spectral line observed=`(4(4+1))/2=10`
It is line of paschen series hence infrared region
( C)`5to1` =10 lines, out of these transitions `5to4,5to3,4to3` transition will be in infrared region and `2to1` will be in U.V. region.
(D)series limit of Balmer series is the last line having 3.4 ev energy.