Lecture 13 - Lecture 13 10/19/10 Wiggling an electron up...

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Lecture 13 – 10/19/10 Wiggling an electron up and down on an antenna can generate radio waves to transmit a) Also generates a magnetic field b) Frequency at which it wiggles determines the emitted wavelength Visible light ranges from 400 to 700 nm There’s no fundamental limit to how small a wave can go only mechanically “Redder” is the longer wavelength (lower energy) and “bluer” is the shorter wavelength (higher energy) Thermal spectrum deals with how much heat you see at the different wavelengths a) Peaks in the visible light range Any object glows based on their temperature and the cooler the object, the redder it is There are only 4 ways light and matter interact a) Transmitted b) Absorbed c) Reflected/scattered- reason sky is blue d) Emitted Thermal radiation a) Ideal radiator is a black body- completely absorbs and emits light at all wavelengths i) Example is a flashlight Spectrum is a plot of intensity of light as a function of wavelength
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This note was uploaded on 05/03/2011 for the course AST 301 taught by Professor Harvey during the Fall '07 term at University of Texas at Austin.

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Lecture 13 - Lecture 13 10/19/10 Wiggling an electron up...

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