lecture5 - energy (higher frequency, smaller wavelength)...

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Thermal Radiation All objects with temperatures above absolute zero emit electromagnetic radiation The spectrum depends on temperature Also called 'Blackbody' radiation: it's what you see emitted even with no reflected light (black object) - Hotter objects emit more radiation per surface area - Hotter objects emit photons with higher average
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Unformatted text preview: energy (higher frequency, smaller wavelength) Consequences: At room temperature, objects glow in IR (our eyes can't see it, but instruments can!) Night vision goggles As you increase the temperature, objects glow red, then white-hot, then blue You can determine the temperature of a star from its color!...
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This note was uploaded on 02/26/2012 for the course PHYSICS 105 taught by Professor Kruse,m during the Spring '08 term at Duke.

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lecture5 - energy (higher frequency, smaller wavelength)...

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