In case of hydrogen spectrum wave number is given by
`barv=R_(H)[(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]` where `n_(1)gtn_(2)`
`{:(,"ColumnI",,"ColumnII"),((A),"Lyman series",(P),n_(2)=2),((B),"Balmer series",(Q),n_(2)=3),((C),"Pfund series",(R),n_(2)=6),((D),"Brackett series",(S),n_(2)=5):}`