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| style="height:20px; width:200px; text-align:center;" |This [[diagram]] shows an [[electron]] gaining [[energy]] by [[Absorb (Physics)|absorbing]] an [[Electromagnetic Wave|electromagnetic wave]] and becoming [[excited]] (moving to a higher [[Energy Level|energy level]]).
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==References==
===AQA===
:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Absorption; lines, page 111, GCSE Physics; Student Book, Collins, AQA']