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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
A microphone is connected to the Y-input of a C.R.O Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produces on the screen are shown in following figure.
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| (a) | (b) | (c) |
- Which trace is due to the loudest sound? Give reason for your answer.
- Which trace is due for the sound with the lowest pitch? Explain your answer.
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:
100 Hz
What is ultrasound?
A man can hear the sound of frequency :
What do you understand by the term infrasonic vibrations?
What are ultrasonic? State and explain two applications of ultrasounds.
What does SONAR stand for? Where do we make use of SONAR?
Ultrasound has frequency of vibration
