sum_lecture06 - or leads the other: Phase What happens when...

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The Physics of Properties of Waves Drs. Paulson and Scully GSCI 121 Summer
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A wave is a disturbance or variation which travels through a medium. The wave speed depends on the medium. Particles in the medium do NOT travel with the wave . Waves transfer energy (but not matter) from a place to another and can do work. Properties of Waves
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We can characterize waves with three properties including wavelength , frequency , and wave speed . Properties of Waves λ f = c Wavelength λ Frequency f Wave Speed c Energy=E ~ A 2
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Properties of Waves What are the amplitude, period and frequency of the following wave? -4 -3 -2 -1 0 1 2 3 4 0 0.5 1 1.5 2
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Properties of Waves The period of a particular wave is 0.01 s. What is the frequency of this wave? The speed of light is 3 x 10 8 m/s. What is the frequency of a radio wave of wavelength 1 m? The speed of sound is 345 m/s. What is the wavelength of a sound wave of frequency 440 Hz?
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The phase of one of the waves could be different from the other. Phase is the angle within the cycle that one trails
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Unformatted text preview: or leads the other: Phase What happens when we combine more than one wave? The principle of superposition says we just add the amplitudes directly to find the resultant wave. Superposition What happens when the phase of one wave is different from the other? The result is another sine wave: Superposition When waves are completely out of phase (that is they differ by 180 or radians), they may completely cancel! Superposition When waves add to produce a larger amplitude, we say that the waves constructively interfere . When waves cancel one another out, we say that the waves destructively interfere . Adding two waves of differing frequencies can produce beats . The beat frequency is the difference between the two frequencies of the waves being added. Superposition f beat = f 2-f 1 Beats Beats This is how you tune an instrument. You count beats. Superposition f beat = f 2-f 1...
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This note was uploaded on 05/23/2011 for the course GSCI 121 taught by Professor Niculescu,m during the Summer '08 term at James Madison University.

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sum_lecture06 - or leads the other: Phase What happens when...

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