Define wavelength of a wave.

The wavelength of a wave is the distance between two consecutive points in a wave that are in phase and have the same position or displacement. In other words, it is the distance between two successive peaks (crests) or troughs (valleys) of the wave. Wavelength is typically denoted by the Greek letter lambda (λ) and is measured in units of length, such as meters (m) or nanometers (nm), depending on the scale of the wave.

Wavelength is an important characteristic of a wave and is used to describe various types of waves, including electromagnetic waves (such as light and radio waves) and mechanical waves (such as sound waves). It is related to the frequency (the number of wave cycles per unit of time) and the speed of the wave through the equation:

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=
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c=λf

Where:

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c represents the speed of the wave.
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λ (lambda) represents the wavelength.
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f represents the frequency of the wave.
This equation shows that for a given wave, as the wavelength increases, the frequency decreases, and vice versa. Waves with shorter wavelengths have higher frequencies, while waves with longer wavelengths have lower frequencies.