# Lecture18 - Last lecture we began discussing waves because...

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Unformatted text preview: Last lecture we began discussing waves because light behaves like a wave in addition to behaving like a particle The basics: what is a wave? Its a transfer of energy from one place to another without transferring matter Common examples are: waves in water (some of the energy from a pebble thrown into a pond is transmitted to the shore) sound waves (energy from my voice is transmitted to your ears) In both cases, matter wiggles as the wave passes by, but then returns to its normal position Lecture 18: Waves Types of Waves The way that matter wiggles is different for waves on a string and sound waves for waves on a string, the molecules in the string wiggle in a direction perpendicular to the direction of the wave any wave that behaves this way is called a transverse wave for sound waves, the air molecules wiggle back and forth in the same direction the wave is traveling any wave that behaves this way is called a longitudinal wave Sinusoidal Waves Waves typically oscillate back and forth periodically We can represent this behavior with a sine wave the distance by which the wiggling matter is displaced from its equilibrium position is a function of both position and time: y x , t ( 29 = - ( 29 Amplitude Wave number Angular frequency Wavelength, Frequency, and Period The wave is periodic in both space and time First, consider a wave frozen at an instant in time (...
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## This note was uploaded on 08/24/2010 for the course PHYS 142 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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Lecture18 - Last lecture we began discussing waves because...

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