Thermal Radiation
- Created by: Sally
- Created on: 21-04-13 10:34
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- Thermal Radiation
- This is also known as infrared radiation, and consists of entirely of EM waves.
- All of objects are continually emitting and absorbing heat radiation.
- An object that's hotter than its surroundings emits MORE radiation than it absorbs- as it cools down.
- An object that's cooler than its surroundings absorbs MORE radiation than it emits- as it warms up.
- Heat is radiated from the surface of an object.
- The bigger the surface area, the more waves can be emitted from the surface, so the quicker the transfer of heat,
- This is why car engines often have fins- they increase the surface area so heat is radiated away quicker. So the engine cools quicker.
- Its the same with heating something up. The bigger the surface area, the more waves exposed to the object, so it will heat up quicker.
- This is why car engines often have fins- they increase the surface area so heat is radiated away quicker. So the engine cools quicker.
- The bigger the surface area, the more waves can be emitted from the surface, so the quicker the transfer of heat,
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