Sound of the frequency below 20 Hz is known asA- UltrasonicB- SonarC- InfrasonicD- Echo

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Sound of the frequency below 20 Hz is known as

Ultrasonic

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Sonar

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Infrasonic

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Echo

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Sound wave having a frequency greater than 20000 Hz is said to be

20 H z

The sound which is below the frequency of 20 Hz is called ___.

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