`{:(,"Column-I",,"Column-II",),((A),"Layman series",(p),"maximum number of spectral line observed" = 6,),((B),"Balmer series",(q),"maximum number of spectral line observed"=2,),((C),"In a sample"5 rarr 2,(r ),2^(nd) "line has wave number"(8R)/(9),),((D),"In a single isolated H-atom for",(s),2^(nd)"line has wave number" (3R)/(4),),(,3rarr1 "transition",,,),(,,(t),"total number of spectral line is" 10,):}`

Answer

`(A) rarr r ; (B) rarr s ; (C ) rarr p ; (D) rarr q`