Properties of Ligh1

# Properties of Ligh1 - Properties of Light Besides using...

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Properties of Light Besides using wavelength to describe the form of light, you can also use the frequency --the number of crests of the wave that pass by a point every second. Frequency is measured in units of hertz (Hz): 1 hertz = 1 wave crest/second. For light there is a simple relation between the speed of light ( c ), wavelength ( ), and frequency ( f ): f = c/ . Since the wavelength is in the bottom of the fraction, the frequency is inversely proportional to the wavelength. This means that light with a smaller wavelength has a higher (larger) frequency. Light with a longer wavelength has a lower (smaller) frequency. The animation shows waves with different wavelengths moving to the right with the same speed. The bottom wave has a wavelength = 3×(wavelength of the top wave). The counter shows how many wavelengths of the top wave have passed the dashed line. In one second, the top wave moves three wavelengths to the right so its frequency is 3 Hz. The bottom wave moves one of its wavelengths in one second so its

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## This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Properties of Ligh1 - Properties of Light Besides using...

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