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ef152-lec-3-3 - Module 3 Lecture 3 Waves A that propagates...

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EF 152 Spring, 2009 Lecture 3-3 1 Module 3, Lecture 3 Waves •1D •2D •3D Physical medium Waves in water Waves in elastic bodies Sound Empty space (a vacuum) Electromagnetic waves A ___________ that propagates in a certain direction with a certain speed. EF 152 Spring, 2009 Lecture 3-3 2 Waves: Basic definitions You are in a boat out on the ocean watching the waves go by. To fully describe the waves, you need three things: 1. A 2. λ 3. f T, period. Time for one wavelength to pass. T=1/f ω , angular frequency. ω =2 π f v, wave velocity. How fast the wave is moving. v= λ f k, wave number. 2 π / λ EF 152 Spring, 2009 Lecture 3-3 3 Examples: Tsunami and Ultrasound Given: Satellite photos of the December 26, 2004 tsunami showed a spacing of wave crests of 800 km and a period between the waves of 1 hour. Required: Speed of waves in km/hr Given: In a typical ultrasound, waves travel through body tissue with a speed of 1500 m/s. For a good detailed image, the wavelength should be no
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ef152-lec-3-3 - Module 3 Lecture 3 Waves A that propagates...

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