What are ultrasonic waves ?

Sound waves having frequency shorter than audio frequency range

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Sound waves produced in a vaccum

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Sound waves having frequency higher than audio-frequency range

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None of these

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Solution

The correct option is C Sound waves having frequency higher than audio-frequency range
The audible frequency range for human ear is from 20Hz to 20000Hz , above frequency 20000Hz , sound waves are called ultrasonic and below 20Hz , they are infrasonic . So it is clear that sound waves having frequency higher than audio frequency range (20.000Hz) , are ultrasonic waves .

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