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*[[Vacuum]] - [[Light]] is [[transmitted]] through a [[vacuum]] at 300,000,000m/s.
: [[Light]] can also be [[scatter]]ed when being [[transmitted]] through a [[medium]] which is when the [[light]] collides with a [[particle]] in that [[medium]] and changes direction. The sky is blue because the [[Nitrogen]] in the [[Earth's Atmosphere|atmosphere]] [[scatter]]s blue [[light]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Mediums, pages 174, 180-181, GCSE Physics; Third Edition, Oxford University Press, AQA '']