Question

number of spectral line of lyman series obtained in Helium plus Ion sample when electron De excited from fourth excited state is​

Answer 1

Answer:

Explanation:Fourth excited state is the fifth orbit ,so from fifth orbit to Lyman series there are ten spectral lines .i.e.,5=>4,5=>3,5=>2,5=>1,4=>3,4=>2,4=>1,3=>2,3=>1,2=>1....

Formula is (n2-n1)(n2-n1+1)/2

n2=5,n1=1........so ten spectral lines...,