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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 in the direction of propagation.

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

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The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

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The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.

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In physics, electromagnetic radiation refers to the waves of the electromagnetic field, propagating through space time, carrying electromagnetic radiant energy.

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The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.

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Frequency is the number of occurrences of a repeating event per unit of time.

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the maximum extent of a vibration or oscillation, measured from the position of equilibrium

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In physics, the wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats, and thus the inverse of the spatial frequency