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

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Ultrasonic sound.

Infrasonic sound.

Sonic sound.

None of these

answer is A.

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Detailed Solution

Concept: Sound frequencies below 20 hertz, or 20 Hz, per second cannot be heard by human ears. Anything with a vibrational frequency lower than that will not be audible to people. The sound's volume will determine the wave's amplitude because the human ear cannot distinguish frequencies higher than 20,000 vibrations per second (20 KHz). Therefore, all frequencies between 20 Hz and 20 KHz are included in the range of inaudible frequencies.
A low frequency signal that is inaudible to human ears is referred to as an infrasonic signal. While inaudible sound at higher frequencies is referred to as ultrasonic sound.
Consequently, ultrasonic sound is the term used to describe sound waves with a frequency greater than 20000 Hz.
Hence, the correct option is 1.

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