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प्रश्न
What is ultrasound?
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उत्तर
Sounds of frequency above 20 kHz are called ultrasound.
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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.
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:
Bats can produce and hear ___________ sound.
Explain how do bats locate the obstacles and prey in their way.
The properties of ultrasound that make it useful are
What do you understand by the term infrasonic vibrations?
What does SONAR stand for?
What are ultrasonic? State and explain two applications of ultrasounds.
What is echocardiography?
1 hertz is equal to
