I have heard that soot is a good emmitter/absorber
of blackbody radiation. I have also heard that
shine metals are good reflecters of blackbody radiation.
I have two questions:
Is black spray paint a good emmitter/absorber, like soot, of blackbody
Is chrome a good reflecter of blackbody radiation?
Black spray paint is not as good as soot [or black felt available from
Edmund's Scientific] because it forms a shiny coating -- at least compared
to soot. This shiny coating reflects some light [You can see your image in
it.] so it is not absorbing all the light that falls upon it.
Polished chrome is a good reflector, not as good as aluminum, silver, and
gold, but pretty good.
One technicality. When you talk about "blackbody radiation" you have to
include, not only visible light, but ultraviolet and infrared radiation. It
is possible to have good/bad
absorbance/reflectance in the visible but not in other parts of the
electromagnetic spectrum outside the visible range of 400-700 nanometers.
Click here to return to the Physics Archives
Update: June 2012