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features a wiki-based effort to tell the story of spectroscopy -- the use of light to study matter. Find answers to questions about the basic theory of light, energy, and the electromagnetic spectrum. What is light? How is it created? How does it affect matter? What is energy? Learn about everyday applications of spectroscopy, including CAT scans, Mars exploration, MRIs, microwaves, sunscreen chemistry, the chemistry of vision, uses of lasers, and more. (National Aeronautics and Space Administration)
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Infra-red radiation is a part of the electromagnetic spectrum, and is one of the ways in which thermal energy (or heat) are transferred from hot to cold objects. Any object will emit some IR radiation, depending how hot it is and what type of material it is made from. This phenomenon allows us to see things that are not otherwise visible to the unassisted human eye. |
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How a camera works |
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