GCSE Physics (AQA)

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Temperature & Emission

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Waves Black body radiation

Temperature & Emission

4:06 Infrared Radiation and Black Bodies
Spec 4.6.3.1 4.6.3.2
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  • The greater the temperature of an object, the more intense the infrared radiation it emits.
  • All objects emit and absorb infrared radiation, affecting their internal energy.
  • A cold person emits fewer infrared waves than a hot person, helping regulate their temperatures.
  • Ovens and heaters emit lots of infrared waves due to high temperatures.
  • Temperature affects the wavelengths of infrared radiation emitted by an object.
  • Hot objects emit shorter wavelengths of infrared radiation compared to cold objects.
  • Very high temperatures cause objects to emit visible light wavelengths.
  • Infrared waves are next to visible light in the electromagnetic spectrum.
  • High temperatures in metals, like a poker, can cause them to glow visibly.
  • At room temperature, a poker emits only infrared waves, which are invisible.
  • At 500 degrees Celsius, a poker emits longer wavelengths, including visible light, causing an orange glow.
  • At 1000 degrees Celsius, a poker emits all visible wavelengths, appearing white.
  • Understanding emitted wavelengths and temperature changes is useful for analyzing light from distant stars.

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