Lesson: Chapter 4 — Waves and their applications
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A dog hears a whistle that its owner cannot. What can you say about the whistle's frequency?
The right answer is the one marked above.
It is above 20 000 Hz. That is ultrasound: above the human hearing range, but within a dog's, which reaches about 40 000 Hz.
Anything between 20 Hz and 20 000 Hz the owner would hear too.
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