The police use high frequency whistle which a dog can hear, but a human cannot . Give reason

Dear Student,
Please find below the solution to the asked query:

The dogs can hear it because it is in their hearing range but not in ours (human) because we can only hear from 20 Hz - 20000 Hz only whereas dogs can hear beyond that.


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Satyendra Singh

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The frequency of most dog whistles is within the range of 23 to 54 kHz,so they are above the range of human hearing, 
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