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lecture33 - Interference(review Interference combination of...

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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 Valley Peak (a) (b) Waves source (a) No shift or shift by (b) Shift by ,... 2 , 1 , 0 1 2 n n r r 2 1 1 2 n r r ) , ( ) , ( ) , ( 2 1 t r t r t r
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