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if you mean in terms of humans then the younger the person the higher pitched noises they can hear.
when air vibrates (sound) enters the ear it only travels so far up the cochlea where sound receptors are located. the deeper the sound the further into the ear it travels.
over time these, nearer to the outside, sound receptors (they're kind of like little hairs) in the ear ware away meaning that higher pitches cannot be heard. This is because even though deeper sounds travel further into the ear they still brush the nearer receptors so these ware first.
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∙ 12y ago
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