GCSE Physics (AQA)

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Temperature & Absorption

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Waves Black body radiation

Temperature & Absorption

4:46 Infrared Radiation and Black Bodies
Spec 4.6.3.2
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  • Objects that absorb more infrared radiation than they emit will increase in temperature.
  • Objects heat up by absorbing infrared waves and release heat by emitting them.
  • The difference between absorption and emission determines temperature changes.
  • Ice cubes absorb a lot of infrared waves but emit few, causing them to heat up.
  • Objects emitting more infrared radiation than they absorb will decrease in temperature.
  • A hot bowl of soup emits more radiation than it absorbs, causing it to cool down.
  • Objects that emit and absorb equal amounts of radiation maintain a constant temperature.
  • An orange absorbs and emits equal amounts of infrared waves, maintaining its temperature.
  • Temperature changes can also occur due to conduction, chemical reactions, etc.
  • The temperature of an object affects the amount of radiation it emits, not absorbs.
  • Cold objects emit fewer infrared waves, losing less heat and increasing temperature more easily.
  • Radiation transfer between warm and cold objects helps equalize their temperatures.
  • Standing near a warm radiator when cold results in absorbing more radiation than emitted, causing warming.
  • The radiator cools down as it gives more heat than it receives.
  • Understanding the relationship between temperature and radiation emission/absorption is important for exams.

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