Black Body Spectrum

Question 1

What is a perfect black body

Answer 1

absorbs all radiation on it
since good absorber = good emitter
black body = perfect emitter

Question 2

what do all bodies do with infra red radiation

Answer 2

emit and absorb

Question 3

if a body is hotter what happens to the amount of infra red it emits

Answer 3

emits more radiation over shorter time

Question 4

for objects hotter then its surroundings what is happening to emit and absorbtion

Answer 4

it is emitting more radiation then absorbing

Question 5

what happens to an object that absorbs and emits radiation at same rate

Answer 5

stay same temperature

Question 6

what is intensity

Answer 6

power of radiation per unit area - i.e how much energy transferred to given area

Question 7

What happens to wavelength as temperature increases

Answer 7

intensity increases
intensity of shorter wave length increase the most

Question 8

What happens to the earth in terms of temperature across a day

Answer 8

stay fairly constant because when its day in one part it is night in another

day time temp increases because absorb more infrared then emit
night time temp decreases because emit more infrared then absrob