Electromagnetic Spectrum

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Electromagnetic Spectrum

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The University of Vermont
Phys 012 - Elementary Physics
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Lecture 7 Outline of Last Lecture I. Electromagnetic Waves a. Ex) Linearly-polarized electromagnetic wave travelling in the +x direction i. Waves will actually oscillate; the diagram above is frozen in time. ii. E = Emaxcos(kx – ωt) ; E = Emaxcos(kx + ωt) if wave was travelling in –x direction iii. B = Bmaxcos(kx – ωt) ; B = Bmaxcos(kx + ωt) if wave was travelling in –x direction iv. ω = angular frequency = 2πf = 2π/T ; f = frequency = 1/T ; T = period v. k = 2π/λ ; λ = wavelength 1. measured in m-1 b. Find wave propagation using right hand rule c. E is always perpendicular to B. d. E and B are in phase (reaching maximum values at the same time). e. E = cB; c = speed of light or any electromagnetic wave travelling through a vacuum = 1/√(μ0ξ) f. In a vacuum, the wave speed is c; c = λf g. Ex) Alternating current voltage supply connected to two conductive bars i. Current will continuously switch directions, causing E and B to switch directions. ii. In an LC circuit… 1. to receive signals from alternating electric field: 2. to receive signals from alternating magnetic field: Econ 101 1st Edition

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