March 21, 2008

March 21, 2008 - o Wave length is the distance between...

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March 21, 2008 o Wave length is the distance between peaks o Can be measures in any length unit o All light travels with speed c=300000km/s o Frequency (f) is the number of times (per second) that the wave moves up or down o Usually measured in hertz o (Wave length)*(frequency)=c o Wave length and frequency describe the color of the light o The shorter the wave length the more cycles pass per second o Think of a train o Light is a particle o Light can also be modeled as a particle Photon: a mass-less particle of electromagnetic radiation energy o Each photon has an energy proportional to its frequency o E=h*f o Photon energy = planck’s constant * frequency o E is proportional to frequency o E is proportional to 1/wavelength o Higher frequencies or shorter wavelength means more energy o UV or X-rays are more dangerous than visible or infrared light o Light as information bearer o We can separate light into its different wavelengths (spectrum) o By studying the spectrum of an object we can learn its
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March 21, 2008 - o Wave length is the distance between...

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