Question

Number of spectral line in Balmer series when an
electron return from 7th orbit to 1st orbit of hydrogen
atom are
(1) 5
(2) 6
(3) 21
(4) 8
plzzz in answer in detail ...n correctly​

Answer 1

Answer: 21

Explanation:

No of lines = (n1+n2-1)(n1-1)/2 {where n1>n2}