F11Physics1CLec13A

F11Physics1CLec13A - Physics 1C Lecture 13A...

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Physics 1C Lecture 13A "Everything in the world has a spirit which is released by its sound." --Oscar Fischinger
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Speed of a Wave For example, an ocean wave is traveling in one direction has a wavelength of 1.0m and a frequency of 1.25Hz. What is the speed (in m/s) of this ocean wave? v wave   f 1.25 m s Please note that the water is not actually moving at this speed, but the wave is propagating at this speed. If a cork were sitting on the water it would most likely just bob up and down.
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Clicker Question 13A-1 In the previous example, if the source of the wave suddenly doubled its frequency how would the previous answer change? A) The velocity of the wave would quadruple. B) The velocity of the wave would double. C) The velocity of the wave would remain the same. D) The velocity of the wave would half. E) The velocity of the wave would decrease by a factor of four.
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Speed of a Wave Let’s say I was the source of a wave, and I wanted to increase the velocity, what can I do? Nothing, velocity is medium dependent. I would have to change the medium. All I can do as a source is affect the frequency, period, and amplitude of the wave. As I change the frequency, the wavelength will change to compensate. The wavelength is known as the dependent variable.
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The shape of the pulse at t = 0 can be set by y = f ( x ). The speed of the pulse is v . For a traveling pulse: y ( x , t ) = f ( x ± vt ), depending on the direction (– to the right, + left). y
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F11Physics1CLec13A - Physics 1C Lecture 13A...

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