How many emission lines will be observed in lyman series whrn electron jumps from 5th energy level?
Answers
Number of emission lines observed in lyman series when electron jumps from 5th energy level are 10.
We know for lyman series n1= 1 that is electrons from any exited state that is from any shell comes to the first shell.
So for lyman series n1 is always 1 and n2 that is from where electron jump can be any shell that is n2 can be 1, 2, 3, 4, 5, 6 and so on, so in this case n2= 5.
Hence n1 = 1 and n2 = 5
To calculate number of spectral lines in transition of electron from n2 to n1we have:--
Number of lines= [(n2- n1)(n2- n1+ 1)]/2
When n1 is 1 the formula is modified as :--
Number of lines = n(n- 1)/2 where n = 5
Substituting values we have:-- 5*(5-1)/2 = 5*4/2 = 10.
Hence number ofof emission lines observed in lyman series when electron jumps from 5th energy level are 10.