Clickers3

# Clickers3 - Which of the following represents a wave...

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When sound travels from air to water A. Frequency changes, wavelength and speed are the same B. Wavelength changes, frequency and speed are the same C. Both wavelength and speed change, the frequency is the same

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The hero of a western movie listens for an oncoming train by putting his ear to the track. Does this method give an earlier warning of the approach of the train than just listening in the usual way? A. No, the hero just wants to look cool. B. No, since the speed of sound in air is larger than the speed of sound in metallic track C. Yes, because the speed of sound in metallic track is larger than that in the air

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Unformatted text preview: Which of the following represents a wave function A. y(x,t) =cos( vx-t ) B. y(x,t) =exp( a x+bt ) C. y(x,t) =log( x-vt ) A sound source and a listener are both at rest but a strong wind is blowing from the source towards the listener. Is there a Doppler effect? A. Yes B. No. Lets consider a coordinate system associated with the wind. Then, both the source and the listener move with the same velocity in one direction. f_L=(v+v_L)/lambda_behind=(v+v_L)/ (v+v_S)f_s=f_S. The answer is no, there is no Doppler effect....
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## This note was uploaded on 02/17/2009 for the course PHY na taught by Professor Richardscalettar during the Spring '09 term at UC Davis.

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Clickers3 - Which of the following represents a wave...

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