You have been hired to invent a whistle to call a
trained pet dog back to its owner. This whistle must
be heard by the dog, but not by humans. Predict
the range of frequencies you could use for your
whistle. What is the name of sound given for such
frequencies?
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Humans can't hear more than 20,000 Hz but dogs can so we would develop an ultrasound whistle which can not be heard by humans as it's frequency is above 20Khz whereas dogs' hearing goes up to 65,000 Hz
But, it has already been invented and is being used by many people.
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