Q12 of 29 Page 180

The grandparents and parents of two-year old girl are playing with her in a room. A sound source produces a 28-kHz sound. Who in the room is most likely to hear the sound?

No one can hear the sound because the range of human hearing is between 20 Hz to 20,000 Hz. While the sound produced is of frequency 28,000 Hz which is more than the upper limit of human hearing range. It is ultrasonic sound wave.


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