Oscillation, Something that moves backwards and forwards., Vibration, Backwards and forwards motion of the parts of a liquid or solid., Energy, Energy is needed to make things happen, Sound, A series of compressions and rarefactions that move through a medium, Amplitude, The distance from the middle to the top or bottom of a wave., Frequency, The number of complete waves or vibration produced in one second (measured in Hertz)., Wavelength, The distance between two identical points on the wave, Peak, The top of a wave, Trough, The bottom of a wave., Transverse, The vibrations are at right angles to the direction the waves moves, Longitudinal, A wave where the vibrations are in the same direction as the direction the wave moves., Pitch, A property of sound determined by its frequency, Compression, The part of a longitudinal wave where the air particles are close together, Rarefaction, The part of a longitudinal wave where the air particles are spread out., Reflection, The change in direction of a ray or wave as a result of its change in speed, Incident wave, The wave coming from a source, Reflected wave, The wave that is reflected from a surface, Vacuum​, A space in which there is no matter, Speed of light, The distance light travels in one second (300 million m/s), Speed of sound, The distance sound travels in one second (330m/s), Echo, A reflection of a sound wave by an object

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