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Definition of electromagnetic spectrum. :the entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light.

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A sound wave is the pattern of disturbance caused by the movement of energy traveling through a medium (such as air, water, or any other liquid or solid matter) as it propagates away from the source of the sound. The source is some object that causes a vibration, such as a ringing telephone, or a person's vocal chords.

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Wave speed is the speed at which a wave travels. Wave speed is related to wavelength, frequency, and period by the equation wave speed = frequency x wavelength. The most commonly used wave speed is the speed of visible light, an electromagnetic wave. ... And that means that its speed can depend only on the medium.

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Frequency is the number of times a point on a wave passes a fixed reference point in one second. ... The SI unit for frequency is the Hertz (Hz), which is equivalent to the older unit cycles per second (cps).

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Amplitude is the displacement of a wave from zero. The maximum amplitude for awave is the height of a peak or the depth of a trough, relative to the zero displacement line.

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Light is measured by its wavelength (in nanometers) or frequency (in Hertz). One wavelength. equals the distance between two successive wave crests or troughs. Frequency (Hertz) equals the number of waves that passes a given point per second.

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In physics, a wave is an oscillation accompanied by a transfer of energy that travels through a medium (mass). Frequency refers to the addition of time. ... A wave is a disturbance that transfers energy through matter or space.