3.1.12

Radiation

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Radiation

Infra-red radiation can transfer thermal energy without a medium (substance to travel through).

Electromagnetic wave

Electromagnetic wave

  • Infra-red radiation is an electromagnetic wave (it is part of the electromagnetic spectrum).
  • We cannot see it but we do feel it as heat.
The Sun

The Sun

  • The infra-red radiation emitted by the Sun transmits thermal (heat) energy to the Earth.
  • Infra-red radiation does not need a medium, so can still travel through space.

Radiation & Surface Colour

Surfaces can either reflect, absorb (take in), or emit (give out) infra-red radiation. Good absorbers (taker inners) of infra-red radiation are usually bad reflectors of infra-red radiation.

White surfaces

White surfaces

  • White surfaces are good reflectors of infra-red radiation.
  • White surfaces are poor emitters and absorbers of infra-red radiation.
Black surfaces

Black surfaces

  • Black surfaces are good emitters, good absorbers and poor reflectors.
Shiny surfaces

Shiny surfaces

  • Shiny surfaces of a colour are poorer absorbers of radiation than dull surfaces of the same colour.
  • Shiny surfacers are poorer emitters and better reflectors than dull surfaces of the same colour.
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1

Biology

1.1

Practicals

1.1.1Microscope & Bacteria1.1.2Bacteria1.1.3Osmosis Tests1.1.4Osmosis & Food Tests1.1.5Enzymes1.1.6Enzymes 21.1.7Photosynthesis & Plant Responses1.1.8Photosynthesis Experiments1.1.9Reaction Time1.1.10Quadrats1.1.11Decay
2

Chemistry

2.1

Practicals

2.1.1Salts2.1.2Neutralisation2.1.3Titration2.1.4Electrolysis2.1.5Electrolysis 22.1.6Rate of Reaction2.1.7Rate of Reaction 22.1.8Chromatography2.1.9Identifying Gases2.1.10Identifying Gases 22.1.11Identifying Ions2.1.12Carbonates, Halides & Sulfates2.1.13Flame Emission Spectroscopy2.1.14Water Purification2.1.15Water Purification 2
3

Physics

3.1

Practicals

3.1.1Specific Heat Capacity3.1.2Thermal Capacity & Insulation3.1.3Latent Heat3.1.4Resistance & Current3.1.5Resistance & Current 23.1.6Density3.1.7Density 23.1.8Force & Extension - Springs3.1.9Waves - Ripple Tank3.1.10Light3.1.11Light Reflection & Refraction3.1.12Radiation3.1.13Radiation 2

Practice questions on Radiation

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    How can we detect infra-red radiation?Multiple choice
  2. 2
    Which of the following statements are true of infra-red radiation?True / false
  3. 3
    Why does the Sun make us feel warm?Multiple choice
  4. 4
    Which of these surfaces is likely to be the best emitter of radiation?Multiple choice
  5. 5
    Which of the following are true of emitters, absorbers, and reflectors?True / false
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Light Reflection & Refraction

Radiation 2