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An element's emission spectrum is the relative intensity of electromagnetic radiation of each frequency it emits when it is heated (or more generally when it is excited).

When the electrons in the element are excited, they jump to higher energy levels. As the electrons fall back down, and leave the excited state, energy is re-emitted, the wavelength of which refers to the discrete lines of the emission spectrum. Note however that the emission extends over a range of frequencies, an effect called spectral line broadening.


The emission spectrum can be used to determine the composition of a material, since it is different for each element of the periodic table. One example is identifying the composition of stars by analysing the received light.

An absorption spectrum occurs when light passes through a cold, dilute gas and atoms in the gas absorb at characteristic frequencies; since the re-emitted light is unlikely to be emitted in the same direction as the absorbed photon, this gives rise to dark lines (absence of light) in the spectrum. The light emitted from an excited atom can not be directed toward the observer, so the light appears to be missing from the continuous spectrum

2007-10-06 10:23:57 · answer #1 · answered by nurwhooo 2 · 0 0

A source of energy--a flame, a plasma, a spark--excites "a lot" of the electrons of an atom to "outer space." As the ion relaxes, the electrons return. (Maybe not the same electrons.) As the electrons descend from one quantized energy level to another, they lose energy, which is emitted in the form of visible light. Because energy levels are quantized, the light is of narrow frequency or wavelength. This causes the light to appear as narrow lines of one frequency/wavelength only.

2007-10-06 10:18:29 · answer #2 · answered by steve_geo1 7 · 0 0

Possibly because of the that is produced do to whatever inter`action that it would have do to the workings taking place near or around said atoms active elements & or core/nu-cle'o'us ......`R`rr.r`r'.

2007-10-06 10:17:56 · answer #3 · answered by ? 5 · 0 0

i'm uncertain I understand what you'r asking, yet whilst it relatively is, "what's the mechanic of light that reasons a spectrum of colorings, and is it a similar mechanic that reasons spectral-result from different wave-development actual phenomenon?" , then the respond is a few thing like this; A wave-development phenomenon (wpp to any extent further) of (enable's say for the sake of having a huge type to artwork with) one thousand cycles consistent with 2d (cps to any extent further) will bend (enable's say) a million degree "inwards" because it passes a million kilometer diametrically previous a factor of gravity. it fairly is the character of wpp that via fact the cps develop, they have a tendency to bend much less from the end results of gravity, so if we develop the cps of the wpp to 2000 cps, it bends in straightforward terms a million/2 degree inwards. Now evaluate a spectrum of cps from one thousand each and each of ways as much as ten,000 cps all passing in a similar distance of that factor of gravity on a similar time and on a similar distance. you will see from this that the beam of wpp that has been all directed in one path would be opened up right into a band with the utmost cps (10,000 cps) bent the least and decrease cps aspects of the wpp bent the main. If this wpp became white gentle, which is composed of photons vibrating at each and every frequency from (no longer the easily numbers, yet for the sake of demonstration in straightforward terms) 10,000 right down to one thousand cps, the photons would be separated into an excellent unfold of diverging guidelines from a million/2 degree to a million degree from diametrical holiday previous the factor of gravity. Now in case you have observed me so some distance, it fairly is the character of the human eye that it reports distinctive cps of photon potential as distinctive colorings, so if we've been in the path of that now diverging beam of photons, we would see a rainbow result relatively of white gentle. this is the spectra of light. desire that facilitates.

2016-10-10 10:33:23 · answer #4 · answered by Anonymous · 0 0

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