Lecture 10 - EM Waves (Ch 24.8)

Lecture 10 - EM Waves (Ch 24.8) - Electro-magnetic waves Ch...

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Unformatted text preview: Electro-magnetic waves Ch 24 The electromagnetic spectrum 4000 5000 6000 7000 Wavelength (Angstroms) 1 Angstrom = 10-10 m Frequency : Number of times per second that a crest passes a Fxed point. moves at speed c Longer wavelength => smaller frequency Will see later that higher frequency => higher energy photons Electromagnetic waves are transverse waves. Direction of travel is: Direction of travel is: Propagation Propagation Problem The transmitter for 98.1 FM is 180m away from your radio. How many wavelengths away are you? If the same station broadcasts at 1150AM how many wavelengths is this? [FM ban frequencies are in megahertz] [AM band frequencies are in kilohertz] Problem The transmitter for 98.1 FM is 180m away from your radio. How many wavelengths away are you? If the same station broadcasts at 1150AM how many wavelengths is this? [FM ban frequencies are in megahertz] [AM band frequencies are in kilohertz] Review Problem A standing wave interference pattern is set up by radio waves between two metal sheets 2m apart. What is the fundamental frequency? Review Problem A standing wave interference pattern is set up by radio waves between two metal sheets 2m apart. What is the fundamental frequency? Review Problem A standing wave interference pattern is set up between two metal sheets 2m apart. If the EM waves were now visible light instead of radio waves, could the pattern that is set up be at the fundamental frequency? Which harmonics would it be possible? Review Problem...
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This note was uploaded on 09/08/2008 for the course PHYS 3B taught by Professor Wu during the Spring '08 term at UC Irvine.

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Lecture 10 - EM Waves (Ch 24.8) - Electro-magnetic waves Ch...

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