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Phys12 - Unit 12 Physical Properties of Waves I 12.1 12.2...

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1 Unit 12 Physical Properties of Waves I 12.1 Types of waves 12.2 Useful quantities in describing waves 12.3 Waves on a string 12.4 Sound waves 12.5 The frequency of a sound wave 12.6 Sound intensity 12.7 Human perception of sound 12.8 The Doppler effect 12.9 Superposition and interference 12.10 Standing waves 12.11 Beats 12.1 Types of waves A disturbance that propagates from one place to another is referred to as a wave. Waves propagate with well-defined speeds determined by the properties of the material through which they travel. For example, sound waves have different speeds in different materials. The following table lists a sampling of sound speed in various materials. Material Speed (m/s) Aluminum 6420 Steel 5960 Copper 5010 Plastic 2680 Fresh water (20 o C) 1480 Air (20 o C) 343 Waves carry energy and propagate it when the waves travel. There are two typical waves, namely, the transverse waves and the longitudinal waves.
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