P6: BLACKBODY RADIATION Flashcards
1
Q
What is a perfect black body?
A
-absorbs all EM radiation which reaches it
-also re-emits all EM radiation (good absorbers are also good emitters)
-temp is constant
2
Q
What does the wavelength and intensity of IR depend on?
A
temp of the object
3
Q
Objects at a constant temp absorb and emit the ________ amount of IR
A
Objects at a constant temp absorb and emit the same amount of IR
4
Q
Why does the earth heat up in the day?
A
lots of radiation is transferred to the earth from the sun and absorbed causing the earth to heat up
5
Q
Why does the earth cool down at night?
A
more radiation is emitted than is being absorbed causing a decrease in temp
