Difference between revisions of "Emission Spectra"
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==Key Stage 4== | ==Key Stage 4== | ||
===Meaning=== | ===Meaning=== | ||
| − | [[File:FlameEmissionSpectroscopy.png|right|300px|thumb|The [[Emission | + | [[File:FlameEmissionSpectroscopy.png|right|300px|thumb|The [[Emission Spectra|emission spectra]] of several [[metal]]s.]] |
'''Emission spectra''' are the specific [[wavelength]]s of [[light]] [[emit]]ted by the [[electron]]s in [[atom]]s as they lose [[energy]]. | '''Emission spectra''' are the specific [[wavelength]]s of [[light]] [[emit]]ted by the [[electron]]s in [[atom]]s as they lose [[energy]]. | ||
===About Emission Spectra=== | ===About Emission Spectra=== | ||
| + | : An '''emission spectrum''' is made by providing [[energy]] to a [[material]] and [[focus]]ing any [[light]] [[emit]]ted through a [[Prism (Physics)|prism]] to separate the [[colour]]s. | ||
: The [[spectrum]] of [[White Light|white light]] is a continuous change of [[colour]]s with all [[wavelength]]s having the same [[intensity]]. | : The [[spectrum]] of [[White Light|white light]] is a continuous change of [[colour]]s with all [[wavelength]]s having the same [[intensity]]. | ||
: An '''emission spectrum''' is a set of specific [[wavelength]]s with a high [[intensity]]. This appears as bright lines of [[colour]] on a [[spectrum]]. | : An '''emission spectrum''' is a set of specific [[wavelength]]s with a high [[intensity]]. This appears as bright lines of [[colour]] on a [[spectrum]]. | ||
| − | : A '''emission spectrum''' is created when [[electron]]s in high [[Energy Level|energy levels]] lose [[energy]] and fall to a lower [[energy]] [[emit]]ting a specific [[wavelength]] of | + | : A '''emission spectrum''' is created when [[excited]] [[electron]]s ([[electron]]s in high [[Energy Level|energy levels]]) lose [[energy]] and fall to a lower [[Energy Level|energy level]] [[emit]]ting a specific [[wavelength]] of [[electromagnetic Wave|electromagnetic wave]] when they do. |
| + | : The [[wavelength]]s of [[electromagnetic Wave|electromagnetic wave]] depend on the [[energy]] difference between the [[Energy Level|energy levels]] in [[atom]]s. | ||
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| + | {| class="wikitable" | ||
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| + | |[[File:Emission.png|center|500px]] | ||
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| + | | style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows an [[excited]] [[electron]] losing [[energy]] by [[emit]]ting an [[Electromagnetic Wave|electromagnetic wave]]. As it does this the [[electron]] falls back down to a lower [[Energy Level|energy level]]. | ||
| + | |} | ||
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| + | ===References=== | ||
| + | ====AQA==== | ||
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| + | :[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Emission spectra, pages 214-15, GCSE Chemistry, Hodder, AQA ''] | ||
| + | |||
| + | ====Edexcel==== | ||
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| + | :[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Emission spectra, page 195, GCSE Chemistry, Pearson, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120193/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120193&linkCode=as2&tag=nrjc-21&linkId=572df39392fb4200db8391d98ae6314e ''Emission spectrum, page 358, GCSE Combined Science, Pearson Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Emission spectrum, page 94, GCSE Physics, Pearson Edexcel ''] | ||
Latest revision as of 11:53, 19 November 2019
Contents
Key Stage 4
Meaning
Emission spectra are the specific wavelengths of light emitted by the electrons in atoms as they lose energy.
About Emission Spectra
- An emission spectrum is made by providing energy to a material and focusing any light emitted through a prism to separate the colours.
- The spectrum of white light is a continuous change of colours with all wavelengths having the same intensity.
- An emission spectrum is a set of specific wavelengths with a high intensity. This appears as bright lines of colour on a spectrum.
- A emission spectrum is created when excited electrons (electrons in high energy levels) lose energy and fall to a lower energy level emitting a specific wavelength of electromagnetic wave when they do.
- The wavelengths of electromagnetic wave depend on the energy difference between the energy levels in atoms.
 |
| This diagram shows an excited electron losing energy by emitting an electromagnetic wave. As it does this the electron falls back down to a lower energy level. |