The highest point on a wave is called its crest, while the lowest point is known as the trough. Waves are characterized by a number of parameters, including wavelength, frequency, and amplitude. The distance between any two successive crests is known as the **wavelength** . It is the same as...

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The highest point on a wave is called its crest, while the lowest point is known as the trough. Waves are characterized by a number of parameters, including wavelength, frequency, and amplitude. The distance between any two successive crests is known as the **wavelength**. It is the same as the distance between any two successive troughs. In fact, the distance between the same point on any two successive waves is the same distance as the wavelength. Since wavelength is a distance, it has the units of length—that is, meters, feet, etc. Wavelength is generally denoted by the symbol `lambda` .

This definition of wavelength is valid for transverse waves. In case of longitudinal waves, wavelength is the distance between any two successive compressions or rarefactions.

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