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About this Episode
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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