radiation Flashcards
1
Q
what is radiation
A
heat given off by all hot objects (above -273•c)
2
Q
Black
A
good absorber + emitter
3
Q
white
A
bad absorber + emitter
4
Q
shiny
A
reflects infa red radiation ( keeping heat in or out)
5
Q
What form is radiation given out in
A
Invisible electromagnetic wave, infa red wave. It’s given out in all directions
6
Q
Best to worst emitters/absorbers
A
Dull black
Shiny black
Dark colours
Light colours
White
Silver
7
Q
why does the hot object cool down
A
it radiates more energy than it absorbs
8
Q
why does the cool object heat up
A
it absorbs radiation from the hot object
