wsl - Wave Motion • Harmonic motion in space and time –...

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Unformatted text preview: Wave Motion • Harmonic motion in space and time. – Focus at one location; depth goes up and down. – Freeze time: depth goes up and down over a distance. • Transfers Energy from one place to an- other. • Longitudinal Waves : displacement is in same direction as direction of wave propa- gation. • Transverse Waves : displacement is per- pendicular to direction of wave propaga- tion. 1 Examples of Waves: 1. Sound Waves (longitudinal): • Caused by vibrations of media. • Has pressure variations in time and space. • Pressure variations cause your eardrum to vibrate back and forth. 2. Electromagnetic Waves (transverse): • Radiated (or emitted) by accelerating charges. (Examples?) • Have electric and magnetic fields which vary in time and space. • Can propagate with no medium. 2 Properties of Waves 1. Amplitude ( A ): Maximum Displacement (of Pressure or E-Field). 2. Wavelength ( λ ): distance between two crests. (at one instant in time). 3. Period ( T ): Time between two crests. (at one location). 4. Frequency ( f ): number of waves passing a point per second: f = 1 /T . 5. Velocity ( v ): speed of propagation; how fast a crest moves. v = λ f 3 Square of the Amplitude, or ”Intensity” varies directly with: • Loudness (sound) • Brightness (light) So, in general, A 2 is a measure of: . Frequency is a measure of: • pitch (sound: higher frequency; higher pitch.) • color (light: higher frequency; bluer color.) 4 Interference Two or more waves can combine to • reinforce each other ( constructive interference ) • cancel each other ( destructive interference ) 5 Standing Waves • A wave can reflect off a boundary and in- terfere with its reflection.terfere with its reflection....
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wsl - Wave Motion • Harmonic motion in space and time –...

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