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General knowledge questions and answersGeneral knowledge questions and answers. Monday, November 28, 2011. 1 What is the frequency range of audible sound? The range of audible frequencies is 20Hz to 20,000Hz. 2 What are ultrasonic waves? Sounds waves of frequencies beyond 20 kHz are called ultrasonic waves. 3 List any six uses of ultrasonic waves? Study of ultrasonic waves gives information about its physical properties like elasticity, configuration of atoms etc. They are used in the dry cleaning of clothes to remove dirt. 4 What is SONAR?
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