Absorption and reflectance spectrums

[hechnal]

hey,

just wondering, what's the relationship between absorption and emissions spectra (i.e. would they absorb and reflect the same wavelengths or complement wavelengths of radiation?)

thanx,

hechnal

 

[Redbelly98]

Light that strikes an object is either:
1. Absorbed
2. Reflected
or
3. Transmitted

These must all add up to 100%:

A + R + T = 100%

For opaque objects, T=0 (no transmission) and the equation simplifies somewhat.

 

[mathman]

hey,

just wondering, what's the relationship between absorption and emissions spectra (i.e. would they absorb and reflect the same wavelengths or complement wavelengths of radiation?)

thanx,

hechnal

For a particular substance, they are the same. It depends on the temperature of the medium relative to the light coming through. Hotter leads to emission, colder leads to absorption.