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Wave
A disturbance that transfers energy from one place to another without transferring matter
Medium
The substance through which a wave travels
Transverse waves
Particles vibrate perpendicular to wave direction
Longitudinal waves
Particles vibrate parallel to wave direction
Amplitude
Maximum displacement from equilibrium
Wavelength
Distance between two consecutive crests or troughs
Frequency
Number of waves passing a point per second
Period
Time for one complete wave cycle
Wave speed =
Frequency x wavelength
Reflection
Waves bounce off surfaces
Refraction
Waves change speed and direction when entering a new medium
Note 
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