Physics1C_Chapter32

Physics1C_Chapter32 - CHAPTER 32 ELECTROMAGNETIC WAVES VahPeroomian MAXWELLS EQUATIONS v v Qencl E d A = eo Gausss Law Gausss Law for Magnetism

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CHAPTER 32 ELECTROMAGNETIC WAVES Vahé Peroomian
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MAXWELL’S EQUATIONS Gauss’s Law Gauss’s Law for Magnetism Faraday’s Law of Induction Ampere-Maxwell Law v E . d v A = Q encl e o Ñ ò v B . d v A = 0 Ñ ò v E . d r l = - d F B dt Ñ ò v B . d r l = Ñ ò m o I + e o m o d F E dt
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ELECTROMAGNETIC WAVES Is the effect of electric and magnetic fields, or of changing electric and magnetic fields instantaneous? No!
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THE EM SPECTRUM The electromagnetic spectrum encompasses gamma rays, x-rays, ultraviolet, visible light, infrared, and radio waves.
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SOME DEFINITIONS Ray Line along which the wave travels. Plane wave Wave emitted along an entire plane, where all points on that plane emit the wave in phase. Wave front A surface connecting points of equal phase on all waves. Spherical wave Wave emitted from a point source. Linearly polarized Wave in which the electric and magnetic fields are restricted to being parallel to certain directions.
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PLANE ELECTROMAGNETIC WAVE
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LINEAR WAVE EQUATION Wave equation for plane waves: 2 y dx 2 = 1 v 2 2 y dt 2
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EM WAVE EQUATION Wave equation for plane EM waves: 2 E ¶x 2 = m o e o 2 E ¶t 2 2 B ¶x 2 = m o e o 2 B ¶t 2
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SPEED OF PROPAGATION EM waves propagate with the speed of light: Light is an electromagnetic wave!!! c = 1 m o e o = 2.998´ 10 8 m / s
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PROPERTIES OF EM WAVES An EM wave is transverse. Both E and B are perpendicular to the direction of propagation of the wave, and perpendicular to each other. Direction of propagation is direction of
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This note was uploaded on 06/03/2011 for the course PHYSICS 1c taught by Professor Peroomian during the Spring '10 term at UCLA.

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Physics1C_Chapter32 - CHAPTER 32 ELECTROMAGNETIC WAVES VahPeroomian MAXWELLS EQUATIONS v v Qencl E d A = eo Gausss Law Gausss Law for Magnetism

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