what do all bodies (objects) no matter their temperature do
emit and absorbinfrared radiation - the hotter the body, the more infrared radiation it radiates in a given time
what is a perfect black body
object that absorbsall of the radiation incident on it - since a good absorber is also a good emitter, a perfect black body would be the best possible emitter
what does a black body not do
reflect or transmit any radiation
a body at constant temperature is absorbing radiation at the same rate as its emitting radiation - temperature of a body increases when the body absorbs radiation faster than it emits radiation
