PHYS 1023 Lecture 9: Chapter 9
24 Aug 2016
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Document Summary
Wave quantities: characterizing a continuous wave. Wavelength: distance between one point and the next similar point. Frequency: number of vibrations per second (hz: number of waves from source per second. Wave speed: speed at which the displacement moves through the medium. Light as a wave: waves travel though a medium. Electromagnetism: charged object creates an electric eld around it. Shake that object, the electric eld in the surrounding space shakes too. And charge in the vicinity will respond to the change in the electric eld: moving charge also creates a magnetic eld that a compass, for instance, would detect. James clark maxwell: studied electromagnetism, noticed a nice symmetry in the elds (almost) Changing magnetic eld creates an electric eld: in order for the theory to be symmetric need one more piece. Changing electric eld creates a magnetic eld: this predicted electromagnetic waves. How fast: maxwell"s theory also predicted the speed of the disturbance.
