# 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 - ϖ t) y 2 = A sin (kx - ϖ t + φ ) Then y R =A R sin (kx- ϖ t+ φ /2) , and the resultant amplitude is A R =2A cos(½ φ 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 π ). 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 ϖ ϖ = - = - detector S 1 S 2 P x 1 x 2 Phase difference : Then (using trig), at detector: 1 2 1 2 ( ) ( ) ( ) kx t kx t k x x k x...
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## This note was uploaded on 05/02/2010 for the course PHYSICS 1E03 taught by Professor Jopko during the Spring '08 term at McMaster University.

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lecture30 - Interference of Sound Interference of Sound...

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