1 For severe stains, add 1-2 cups vinegar to the wash cycle as well. 2  To remove a rust stain from your cotton work clothes, moisten the spot with some full-strength vinegar and then rub in a bit of salt. 3  If itâs warm outdoors, let it dry in the sunlight (otherwise a sunny window will do), then toss it in the wash.
absorption spectrum - the spectrum of electromagnetic radiation that has passed through a medium that absorbed radiation of certain wavelengths. spectrum - an ordered array of the components of an emission or wave.
1 A given atom will absorb and emit the SAME frequencies of electromagnetic (E-M) radiation. 2  A gas of hydrogen atoms will produce an absorption line spectrum if it is between you (your telescope+spectrograph) and a continuum light source, and an emission line spectrum if viewed from a different angle. This is called an emission spectrum (just peaks, not continuous). 2  The E-M radiation frequencies absorbed and emitted match the allowed energy levels in the atom. 3  The allowed energy levels in an atom depend mostly on the electric field configuration.