Do Lines of a particular element appear at the same wavelength in both emission and absorption line spectra?

Question

do lines of a particular element appear at the same wavelength in both emission and absorption line spectra.

Answer 1

yes

Re Sevenlet: if there is such a state, the lines would show up in both the emission and absorption spectra.

Answer 2

Yes.

The lines on the emission spectra correspond to the gaps on the absorption spectra.

They do not all have to be present however, depending on the excited state of the element or energy that the element is absorbing respectively.

bye for now.

Answer 3

They can (provided that the quantum transition is allowed) but need not.

Answer 4

In theory, yes.  The photon absorbed to raise an electron from n=1 to n=2 has the exact same energy as the photon emitted when that electron drops back to n=1.  But there are key differences is what is observed in practice.  First, a photon which is emitted is generally not emitted in the same direction as the one which was absorbed.  That's why you see the dark band in the absorption spectrum, even if just as many photons at that wavelength are absorbed as emitted.  Second, the relative prominence of each line depends on the average energy of the electrons in the element.  A cold gas will have most of its electrons in the n=1 ground state, so the most prominent lines you observe will be in the Lyman series.