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lecture06

# lecture06 - Interference Interference combination of...

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Interference 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 = ± = - m m r r λ ( 29 λ 2 1 1 2 + ± = - m r r ) , ( ) , ( ) , ( 2 1 t r t r t r ψ ψ ψ + =

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Standing waves on a string Standing waves on a string can be thought of as superposition of two traveling waves moving in opposite direction.
Wave interference, boundaries, and superposition Waves in motion from one boundary (the source) to another boundary (the endpoint) will travel and reflect.

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As wave pulses travel, reflect, travel back, and repeat the whole cycle again, waves in phase will add and waves out of phase will cancel.
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lecture06 - Interference Interference combination of...

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