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What is the range of frequency of the waves produced by the Ultrasonic transducer?

What is the range of frequency of the waves produced by the Ultrasonic transducer? Correct Answer 20 Kilohertz to several Gigahertz

Ultrasonic transducers produce frequency ranging from 20 Kilohertz to several Gigahertz. Ultrasounds have a wide range of application in many fields, but majorly they are used for measuring the distance of objects.

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Sounds waves and Motion mcq question image
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Ultrasonic waves are those sound waves having frequency