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Question
What is Galton’s whistle? To what use is it put?
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Solution
A special whistle that can produce ultra sound, not heard by humans, is called Galton’s whistle.
It is used to train dogs because they can hear ultrasounds up to a frequency of 40000 hertz.
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RELATED QUESTIONS
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
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| I | II |
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| III | IV |
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