What are infrasonics? Can you hear them?
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Sounds of frequency lower than 20 Hz are called infrasonic sounds. We cannot hear the infrasonic sounds.
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Write the audible range of frequency for the normal human ear.
What are ultrasonics? Can you hear the ultrasonic sound?
How does a bat make use of ultrasonic waves to find its way?
Name the two characteristics of sound which differentiate any two sounds from each other.