Black Material
February 24th, 2011
Can you explain why light heats up black material?
And how it relates to the refractive index? Basically how does light energy transfer into materials? I know a photon will raise an electron into new orbitals but the electron then returns to its previous orbital and thats how we get color. What is this property of energy absorption?
it does relate to the refractive index, in an opaque material the refractive index is an imaginary number and this somehow creates absorption of light energy, but how?
All light do not excite an electron, and yet it heats.
What is heat you feel ?
If particles of a material (molecules or ions, atoms etc ) vibrate, they have some temp. This is generally how we can feel heat.
A molecule can vibrate in various direction as well as it can rotate.
Light (not necessarily of visible range ) can provide energy to an atom or molecule or ion to vibrate, or rotate, more vigorously. Thus it gives the heating effect.
It does not necessarily heats black material only, go and stand in sun if you doubt !
besides, it has nothing to do with refraction.
Transparent materials refract, and they get heated least by light.
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