Under what conditions does the diffraction of waves appear especially clearly.

Diffraction manifests itself clearly if the size of the obstacle is commensurate with the wavelength. If we consider the speed of sound in air equal to 330 meters per second, then the dimensions of the obstacles on which we observe the diffraction of sound waves can be from 1.65 centimeters to 20 meters (the frequency of sound waves varies from 16 to 20,000 Hz).

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