what is the meaning of wave length ? Give the example for longitudinal wave? Thank you

definition -

Wavelength is the distancebetween identical points in the adjacent cycles of a waveform signal propogated in space or along a wire, as shown in the figure.

 

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Longitudinal wave example:

Longitudinal waves include sound waves (alternation in pressure, particle displacement, or particle velocity propagated in an elastic material) and seismic P-waves (created by earthquakes and explosions).