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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium. While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.

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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. ... At 20 °C (68 °F), the speed of soundis 343 metres per second (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or a kilometre in 2.91 s or a mile in 4.69 s.

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speed of light definition. The distance light can travel in a unit of time through a given substance. Light travels through a vacuum at about 186,000 miles, or 300,000 kilometers, per second. ( See E = mc 2, electromagnetic waves, relativity, and twin paradox.)

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the rate at which something occurs or is repeated over a particular period of time or in a given sample.

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

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electromagnetic spectrum. n. The entire range of electromagnetic radiation, which includes, in order of increasing frequency and decreasing wavelength, radio waves, microwaves, infrared radiation, visiblelight, ultraviolet radiation, x-rays, and gamma rays.

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Definition of electromagnetic wave. :one of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

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the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.