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a comb or tuft of feathers, fur, or skin on the head of a bird or other animal.

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a long, narrow, open container for growing plants or mixing chemicals.

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Vibration, periodic back-and-forth motion of the particles of an elastic body or medium, commonly resulting when almost any physical system is displaced from its equilibrium condition and allowed to respond to the forces that tend to restore equilibrium.

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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.

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a wave vibrating at right angles to the direction of its propagation.

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Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM radio broadcasting

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Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit

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Refraction, in physics, the change in direction of a wave passing from one medium to another caused by its change in speed

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a wave vibrating in the direction of propagation.