Physics 202, Lecture 21
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1 Physics 202, Lecture 21 Today s Topics Electromagnetic waves (overview) Maxwell s equations Examples of EM waves Wave Motion (Review ch. 16)
2 Wave: General Waves (Review of Ch. 16) Propagation of a physical quantity in space over time q = q(x, t) Examples of waves: Water wave, wave on string, sound wave, earthquake wave, electromagnetic wave, light, quantum wave. Waves can be transverse or longitudinal.
3 Seismic Waves Longitudinal Transverse Direction of Propagation Transverse Transverse Direction of Propagation
4 Wave On A Stretched Rope It is a transverse wave The wave speed is determined by the tension and the linear density of the rope: conceptual understanding only
5 Wave Function Waves are described by wave functions in the form: y: A certain physical quantity e.g. displacement in y direction f: Can be any form y(x,t) = f(x-vt) x: space position. Coefficient arranged to be 1 t: time. Its coefficient v is the wave speed v>0 moving right v<0 moving left
6 Practical Technique: Identify Wave Speed in A Wave Function A wave function is in the form: What is the wave speed: Answer: 3.0 m/s to the right Illustrate wave form at t = 0s,1s,2s t=0 t=1 t=2
7 Example of waves: Tsunami
8 Sinusoidal Wave A wave describe a function y=asin(kx-ωt+φ) is called sinusoidal wave. (Harmonic wave) wave speed v = ω/k = λf At each fixed position x, the element is undergoing a harmonic oscillation. The amplitude, frequency and phase constant of this oscillation are: A, ω, -kx-φ If we fix t and take a snap shot, the wave form is periodic over space (x). The spacing period λ is called wavelength and λ=2π/k (see next page)
9 Parameters For A Sinusoidal Wave Snapshot with fixed t: wave length λ=2π/k Snapshot with fixed x: angular frequency =w frequency f =ω/2π Period T=1/f Amplitude =A Wave Speed v=ω/k v=λf, or v=λ/t Phase angle difference between two positions Δφ =-kδx Snapshot:Fixed t Snapshot:Fixed x
10 Sound waves: flute Speed of sound is 340 m/s. Length of a flute is ~ 0.6m. What is the lowest note flutes can make?
11 Sound waves: flute Speed of sound is 340 m/s. Length of a flute is ~ 0.6m. What is the lowest note flutes can make? f = c/2l = (340 m/s)/(1.2 m) = 280 Hz ( B, one note below middle C ) Listen.
12 Tacoma Narrows Bridge
13 Linear Wave Equation Linear wave equation certain physical quantity Sinusoidal wave f: frequency φ:phase Solution Wave speed A:Amplitude λ:wavelength v=λf k=2π/λ ω=2πf General wave: superposition of sinusoidal waves
14 Maxwell Equations (preview) Gauss s Law/ Coulomb s Law Gauss s Law of Magnetism, no magnetic charge Faraday s Law Ampere Maxwell Law Also, Lotentz force Law These are the foundations of the electromagnetism
15 Electromagnetic Waves EM wave equations (from last 2 of Maxwell s eqns) Plane wave solutions: E= E max cos(kx-ωt+φ) B= B max cos(kx-ωt+φ) Speed of EM wave: y E c B z x Wavelength and Frequency Relationship: In vacuum EM wave can be transmited in vacuum!
16 The EM Wave B E z y c x Two polarizations possible (showing one)
17 f (Hz) λf=c λ Spectrum of EM Waves GHz MHz VHF: MHz UHF: 300 MHz -3.0 GHz Cell phone: 800/900/1800/1900 MHz Wifi: 2.4/5 GHz Microwave Oven: 2.4 GHz Cordless phone: 0.9/2.4/5.8 GHz
18 Wavelength For TV Signals Wavelength and frequency relationship for EM wave In vacuum Example: Determine the wavelength (in air) of an EM wave of frequency 687 MHZ (HDTV channel 3, CBS = UHF ch. 50) VHF: λ = 1-10 m, UHF: λ = m Over-The-Air (OTA) DTV channels: 90% of them in UHF band λ ~ m
19 Now you see it, now you don t: x-ray vs visible light unknown, 2011 Bertha Roentgen, 1895 me, 2005 visible X-ray
20 Now you see it, now you don t: x-ray vs visible light Neutrinos from SN-1987A SN1987A confirmed our understanding of: Luminosity energies of neutrinos duration of burst are qualitatively correct. Supernova 1987A 23 February 1987 Reina Maruyama, Univ. of Wisconsin ANL, March 17, 2009
21 Now you see it, now you don t: x-ray vs visible light
22 Now you see it, now you don t: Infrared vs visible light
23 Now you see it, now you don t: Infrared vs visible light Infrared (IR), false color added visible
24 Strings on a Bass
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