Thursday, September 4, 2008
radiation is different from conduction and convection.
+ RADIATION DOES NOT REQUIR A MEDIUM FOR ENEGRY TRANSFER.
- radiation can take place in a vacuum.
- thermal energy from infrared waves is called radiant heat.
the hotter the object, the greater the amount of radiant heat emitted.
*Infrared radiation is absorbed by all objects and surfaces.
*The absorption of radiation causes a temperature rise.
factors affecting rate of infrared radiation:
1. colour and texture
- dull, black surfaces are better emitters of infrared radiation.
2. surface temperature
- the higher the temperature of the suface of the object relative to the surrounding temperature, the higher the rate of infrared radiation.
3. surface area
- larger surface area will emit infrared radiation at a higher rate.
WE JUSTLOVE PHYSICS!!
5:40 AM
