Wave - a long body of water curling into an arched form and breaking on the shore., Length - the measurement or extent of something from end to end; the greater of two or the greatest of three dimensions of a body., Echolocation - Human echolocation is the ability of humans to detect objects in their environment by sensing echoes from those objects, by actively creating sounds: for example, by tapping their canes, lightly stomping their foot, snapping their fingers, or making clicking noises with their mouths, Amplitude - The amplitude ( ) of a wave is the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough ., Decibel - a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale., Standing waves - a vibration of a system in which some particular points remain fixed while others between them vibrate with the maximum amplitude., Refraction - Refraction, in physics, the change in direction of a wave passing from one medium to another caused by its change in speed. For example, waves in deep water travel faster than in shallow. ... The speed of sound waves is greater in warm air than in cold.,  Reflection - Reflection, abrupt change in the direction of propagation of a wave that strikes the boundary between different mediums.,

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