To learn more about this topic, start your googling with these keywords:


frequency - how often a wave occurs in a certain unit of time

Hertz - a unit of frequency (Hz), the number of waves that occus in a second

pitch - a perceptual property of sounds that allows their ordering on a frequency-related scale

echolocation - the location of objects by reflected sound

refraction - the change in direction of a wave

diffraction - the bending of waves around obstacles and the spreading out of waves beyond openings


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