Absorption and reflectance spectrums

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    Absorption Reflectance
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SUMMARY

The relationship between absorption and emission spectra is directly linked to the temperature of the medium. For a specific substance, the absorption and emission spectra correspond to the same wavelengths, with the distinction that higher temperatures lead to emission while lower temperatures result in absorption. The fundamental equation governing these interactions is A + R + T = 100%, where A represents absorption, R represents reflection, and T represents transmission. For opaque objects, transmission (T) is zero, simplifying the analysis of light interaction.

PREREQUISITES
  • Understanding of absorption and emission spectra
  • Knowledge of thermodynamics related to temperature and radiation
  • Familiarity with the principles of light interaction with matter
  • Basic grasp of the equation A + R + T = 100%
NEXT STEPS
  • Research the principles of Planck's Law and its application to emission spectra
  • Explore the concept of blackbody radiation and its relevance to temperature and light
  • Study the effects of different materials on absorption and reflection of light
  • Investigate the applications of spectroscopy in various scientific fields
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Students and professionals in physics, materials science, and optical engineering, as well as anyone interested in the behavior of light and its interaction with different substances.

hechnal
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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
 
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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.
 
hechnal said:
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.
 

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