lecture30 - Interference of Sound Interference of Sound...

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Unformatted text preview: Interference of Sound Interference of Sound Waves Waves Interference Interference 2 waves, of the same frequency; out of phase. Eg. y 1 = A sin (kx - t) y 2 = A sin (kx - t + ) Then y R =A R sin (kx- t+ /2) , and the resultant amplitude is A R =2A cos( 29 . Identical waves which travel different distances will arrive out of phase and will interfere, so that the resultant amplitude varies with location. Quiz y You are located at position y, where you can hear a loud sound - the first maximum in intensity from two speakers. The speakers are then connected out of phase (difference of ). What will you hear? A) no change same loud sound B) no sound C) something between no sound and loud sound Example: Two sources, in phase ; waves arrive at P by paths of different lengths : At P: 1 0 1 2 0 2 sin( ) sin( ) y A kx t y A kx t = - = - detector S 1 S 2 P x 1 x 2 Phase difference...
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This note was uploaded on 10/14/2011 for the course ENGINEER CHEM ENG 3 taught by Professor Ghosh during the Spring '11 term at McMaster University.

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lecture30 - Interference of Sound Interference of Sound...

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