# Lect03 - Lecture 3 Review Examples and Phasors A A1 A1 =45...

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Lecture 3, p 1 Lecture 3: Review, Examples and Phasors S 1 S 2 d λ A 1 A 1 φ A φ = 45 ° 8 / λ δ =

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Lecture 3, p 2 Review: The Harmonic Waveform ( 29 ( 29 ( 29 ( 29 speed amplitude (defined to be positive) 2 wavelength wavenumber frequency 2 , cos 2 angul frequency ar cos 2 cos is the displacement from equilibrium. y x t A x vt A kx ft A kx t v A k f f y π λ ϖ = - - - A snapshot of y( x ) at a fixed time, t : This is review from Physics 211/212. For more detail see Lectures 26 and 27 on the 211 website. λ Wavelength Amplitude A defined to be positive A x v A function of two variables: x and t .
Lecture 3, p 3 Act 1 The speed of sound in air is a bit over 300 m/s , and the speed of light in air is about 300,000,000 m/s . Suppose we make a sound wave and a light wave that both have a wavelength of 3 meters . 1. What is the ratio of the frequency of the light wave to that of the sound wave? (a) About 1,000,000 (b) About 0.000001 (c) About 1000 2. What happens to the frequency if the light passes under water? (a) Increases (b) Decreases (c) Stays the same 3. What happens to the wavelength if the light passes under water? (a) Increases (b) Decreases (c) Stays the same

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Lecture 3, p 4
Lecture 3, p 5 Act Act 1 1 - - Solution Solution The speed of sound in air is a bit over 300 m/s , and the speed of light in air is about 300,000,000 m/s . Suppose we make a sound wave and a light wave that both have a wavelength of 3 meters . 1. What is the ratio of the frequency of the light wave to that of the sound wave? (a) About 1,000,000 (b) About 0.000001 (c) About 1000 and light light sound sound v f v f 1,000,000 1,000,000 v f λ = 2245 2245

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Lecture 3, p 6 Act Act 1 1 - - Solution Solution The speed of sound in air is a bit over 300 m/s , and the speed of light in air is about 300,000,000 m/s . Suppose we make a sound wave and a light wave that both have a
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## This note was uploaded on 01/19/2012 for the course PHYS 214 taught by Professor Staff during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect03 - Lecture 3 Review Examples and Phasors A A1 A1 =45...

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