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The Physics of Sound w/ Bill Nye the Science Guy
Twenty Thousand Hertz
Can Dog Whistles Work?
The lowest possible range of human hearing is about 20 hurts. The upper range is about 20 thousand herts, which is where our name comes from. Some animals can hear weigh higher than we can. For instance, dogs can hear up to around forty thousand hurts. This is why dog whistles work.
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