1Unit 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 12.9Superposition and interference 12.10Standing waves 12.11Beats 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 oC) 1480 Air (20 oC) 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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