Review1 - Review 1 What is mechanical wave? A disturbance...

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Review 1
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What is mechanical wave? A disturbance travels through medium. Waves transport energy, but not matter. transverse : displacement direction of travel longitudinal: displacement || direction of travel
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sinusoidal wave moving + x direction ( , ) cos( ) cos 2 ( ) x t y x t A kx t A T ϖ π λ = - = - Amplitude phase 2 k = 2 T ϖ=
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The speed of transverse waves on a string F v μ =
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Wave Intensity : Inverse square law 2 4 P I r π = 2 1 2 2 2 1 I r I r =
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Principles of superposition If there are more than 1 charge, the total force acting on that charge is the vector sum of the forces exerted by the individual charges Superposition of electric fields 1 2 3 ( , ) ( , ) ( , ) ( ( , ) ) y x t y x t y t x t x y + = + L 1 2 3 4 E E E E E = + + + + r r r r r L
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String, both ends fixed. 2 ( 1,2,3, ) 2 n L L n n n λ = = = L 1 2 2 n n n F f v n f L L μ = = =
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Sound intensity level: 0 (10 ) log I dB I β=
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Standing Sound Waves and Normal Modes
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Review1 - Review 1 What is mechanical wave? A disturbance...

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