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Vibrations are not sound as such. Sound is defined by the way that vibrations are perceived. Hence the riddle "If a tree were to fall in the forest and there were nothing around to hear it, would it make a sound?"

The sound we hear is our bodies way of detecting and analyzing these vibrations. Vibrations cause our ear drums to resonate with a frequency proportional to the vibration, giving us the frequency range of our hearing. This range may be determined by the physical properties of the ear drum or the brain just disregarding irrelevant information (this is more biological science than physical).

The brain analyses these vibrations via electrical signals that are sent from the ear drum. This is what we "hear". Our bodies have evolved to analyze the vibrations that affect our lives in an every day scenario i.e, a potential threat, finding food or a mate).

Many species have hearing ranges and accuities that are far superior to the human perception, such as bats, dogs, dear, and many others. Bats even generate ultrasonic vibrations and perceive the reflected ultrasonic frequencies well enough to navigate during flight.

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13y ago

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