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==Key Stage 4==
===Meaning===
[[File:BlackBodyRadiationSpectrum.png|right|300px|thumb|This is a [[graph]] of the '''black body radiation''' [[spectrum]] for several [[temperature]]s.]]
'''Black body radiation''' is the [[Electromagnetic Wave|electromagnetic radiation]] given off by all [[object]]s with a [[temperature]] above [[Absolute Zero|absolute zero]] (0 Kelvin or -273°C).
: The [[frequency]] of [[Electromagnetic Wave|electromagnetic wave]] depends upon the [[temperature]] of the [[object]]. The higher the [[temperature]] the higher the [[frequency]] of [[Electromagnetic Wave|electromagnetic wave]].
: The [[Sun]] [[emit]]s [[Visible Light|visible light]] because its [[temperature]] is so high.
: [[Object]]s at [[Room Temperature|room temperature]] [[emit]] [[Infra-red]] [[radiation]]. This can be seen using a [[Thermal Imaging|thermal imaging camera]].
: The [[colour]] of an [[object]] affects the rate at which it [[Absorb (Physics)|absorbs]] or [[emit]]s [[infra-red]] [[radiation]]. Dark [[colour]]s both [[Absorb (Physics)|absorbs]] and [[emit]] [[infra-red]] [[radiation]] more quickly than [[light]] [[colour]]s.
: [[Reflectivity|Reflective]] surfaces [[emit]] the least '''black body radiation'''.
: When the rate of [[emission]] and [[Absorb (Physics)|absorption]] are the same then an [[object]] will remain at a constant [[temperature]]. If the rate of [[emission]] is greater than the rate of [[Absorb (Physics)|absorption]] then the [[object]] will decrease in [[temperature]]. If the rate of [[emission]] is less than the rate of [[Absorb (Physics)|absorption]] then the [[object]] will increase in [[temperature]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Black body radiation, page 210, GCSE Physics, Hodder, 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 ''Black body radiation, page 27, GCSE Physics; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac32 ''Black body radiation, page 87, GCSE Physics; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Black body radiation, pages 260, 261, GCSE Physics; The Complete 9-1 Course for AQA, CGP, 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 ''Black body, pages 232-3, GCSE Physics; Student Book, Collins, AQA '']