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प्रश्न
What do you understand by the term ultrasonic vibrations?
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उत्तर
Those vibrations, whose frequency is more than 20000 hertz and are not perceived by human ear, are known as ultrasonic vibrations.
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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.
Which has the higher frequency - ultrasonic sound or infrasonic sound?
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The properties of ultrasound that make it useful are
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How do bats locate their prey during a flight?
What is Galton’s whistle? To what use is it put?
What are hearing aids?
State the main components of a hearing aid.
