1.

Define ultrasonic sound​

Answer»

Answer:

The term "ultrasonic" applied to sound refers to anything above the frequencies of audible sound, and nominally INCLUDES anything over 20,000 Hz.

Explanation:

Ultrasonic hearing is a recognised auditory effect which allows HUMANS to perceive sounds of a much higher frequency than would ordinarily be audible using the physical INNER ear, usually by stimulation of the BASE of the cochlea through bone CONDUCTION.



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