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Unformatted text preview: Interference (review) Interference – combination of waves (an interaction of two or more waves arriving at the same place) Important : principle of superposition (a) If the interfering waves add up so that they reinforce each other, the total wave is larger; this is called “constructive interference ”. (b) If the interfering waves add up so that they cancel each other, the total wave is smaller (or even zero); this is called “destructive interference ”. Valley alley Peak (a) (b) Waves source (a) No shift or shift by (b) Shift by ,... 2 , 1 , 1 2 n n r r 2 1 1 2 n r r ) , ( ) , ( ) , ( 2 1 t r t r t r Question: Two speakers S 1 and S 2 are driven by the same signal generator and are different distances from a microphone P as shown. The minimum frequency for constructive interference to occur at P is __ Hz. (The speed of sound is v = 340 m/s.) ,... 2 , 1 , 1 2 n n r r Hz m m s m r...
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This note was uploaded on 10/21/2010 for the course PHYS 221 taught by Professor Herrera-siklody during the Fall '08 term at Iowa State.
- Fall '08