Lec-22 - Previous Lecture Mechanical waves satisfy the Wave...

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Previous Lecture Mechanical waves satisfy the Wave Equation 2 D ∂x 2 1 v 2 2 D ∂t 2 =0 November 12, 2007 – p.
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Today Energy transport in waves Maxwell’s Equations have wave-like solutions. – p.
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Energy transport Mechanical waves transport energy from source to destination. – p.
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Energy transport Mechanical waves transport energy from source to destination. Average power is ± P ² = 1 2 µA 2 ω 2 v – p.
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Energy transport Mechanical waves transport energy from source to destination. Average power is ± P ² = 1 2 µA 2 ω 2 v Electromagnetic waves transport energy as well – p.
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EM waves How does an EM wave get started? An antenna “shakes” the electric field: – p.
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EM Wave Propagation Near the antenna Far away B E At large distances, a small part of a spherical wave looks like a plane wave. – p.
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Plane Wave The EM wave consists of both electric and magnetic fields: E = E 0 sin( kx ωt ) ˆ j B = B 0 sin( kx ωt ) ˆ k We will show these E and B waves satisfy Maxwell’s Equations. – p.
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This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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Lec-22 - Previous Lecture Mechanical waves satisfy the Wave...

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