Question

If each hydrogen atom is exerted by giving 8.4 ev of energy then the number of spectral lines emitted is equal to

Answer 1

Isolated hydrogen atom can absorb any of the following quanta of energy,

given by the equation

Energy absorbed =13.6 ( 1 - ( 1 / n² ) e.v.

where n can take whole number values from 1 to infinity.

For any value of 'n' it cannot be 8.4 e.v.

So, hydrogen atom out rightly rejects that quantum. No electronic excitation takes place- no emission of radiation and it will not result in any spectral line.