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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 sentences:
An average person can hear sound of frequencies in the range ______ to _________.
Complete the following sentence:
Infrasonic sound is of frequency ______________.
Complete the following sentence:
Elephants produce ____________sound.
Name the sound of the frequency given below:
1000 Hz
Name the sound of the frequency given below:
40 kHz
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
Is the energy carried by the ultrasound very high or very low?
1 hertz is equal to
The range of audible frequency for the human ear is
