slides21all - EM Wave Generation – p. EM Wave Propagation...

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Previous week Mechanical waves satisfy the Wave Equation 2 D ∂x 2 - 1 v 2 2 D ∂t 2 =0 –p
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Today make up demo for 9:20 lecture. Maxwell’s Equations have wave-like solutions. –p
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Refection The end oF the rope is ±xed. Wave is reflected with sign change. Imagine a wave with opposite sign coming from the other direction. –p
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Refection The end oF the rope can move. Wave is reflected without change of sign Imagine a wave with same sign coming from the other direction. –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. Electromagnetic waves transport energy as well –p
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Unformatted text preview: EM Wave Generation – p. EM Wave Propagation Near the antenna Far away B E Fig. 32-8 – p. Plane Wave Fig. 32-9 – p. Maxwell’s 3 rd Equation (Faraday’s Law) – p. Maxwell’s 4 th Equation (Generalized Ampere’s Law) Fig. 32-11 – p. 1 The Bottom Line Maxwell’s equations imply that E and B satisfy wave equations: ∂ 2 E ∂x 2-1 c 2 ∂ 2 E ∂t 2 = 0 ∂ 2 B ∂x 2-1 c 2 ∂ 2 B ∂t 2 = 0 with velocity v = c . – p. 1 Electromagnetic Waves Fig. 32-12 – p. 1 EM Wave Detection Fig. 32-19a – p. 1 EM Wave Detection Fig. 32-19b – p. 1 Energy Transport – EM waves Fig. 32-14 – p. 1...
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This note was uploaded on 08/06/2008 for the course PHYS 21 taught by Professor Hickman during the Fall '07 term at Lehigh University .

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slides21all - EM Wave Generation – p. EM Wave Propagation...

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