Number of possible spectral lines which may be emitted in Brackett series in H atom, if electrons present in 9^(th) excited level returns to ground level, are

Number of possible spectral lines which may be emitted in Brackett ser

1.	Number of possible spectral lines which may be emitted in Brackett series in H atom, if electrons present in 9^(th) excited level returns to ground level, are
Answer» 21 6 45 5 Solution :No. of Spectral lines= `SUM DELTA N` `sum 10-1 = 9 +8+7 + 6 + 5 + 4 +3+2 + 1` No of lines in BRACKETT series = 6