Sound waves having frequencies than 20-000 Hz are called - -

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The audible frequency range for human ear is from 20Hz to 20000Hz - waves having frequency above 20000Hz - are called ultrasonic and below 20Hz - they are called infrasonic -

Sound waves having frequencies more than 20,000 Hz are called .......... .

The audible frequency range for human ear is from 20Hz to 20000Hz , waves having frequency above 20000Hz , are called ultrasonic and below 20Hz , they are called infrasonic .