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प्रश्न
What is Galton’s whistle? To what use is it put?
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.
 |
 |
| I | II |
 |
 |
| 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.
Name the sound of the frequency given below:
10 Hz
Name the sound of the frequency given below:
40 kHz
The properties of ultrasound that make it useful are
What do you understand by the term ultrasonic vibrations?
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
What are ultrasonic? State and explain two applications of ultrasounds.
What are infrasonic and ultrasonic sounds?
State the properties of ultrasound that make it useful.
