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प्रश्न
What is Galton’s whistle? To what use is it put?
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उत्तर
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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संबंधित प्रश्न
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 |
Which diagram shows
- a note from a musical instrument
- a soft (or feeble) note,
- a bass (low frequency) note.
Complete the following sentence:
Elephants produce ____________sound.
Explain how do bats locate the obstacles and prey in their way.
A man can hear the sound of frequency :
What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
What are infrasonic and ultrasonic sounds?
Is the energy carried by the ultrasound very high or very low?
Bats produce ______ sound during screaming.
The range of audible frequency for the human ear is
