The sounds that cannot be heard by humans are:

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Inaudible sounds

Infrasounds

Ultrasounds

All of the above

answer is D.

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Detailed Solution

Concept: The human ear can only hear in the range of frequencies 20 hertz to 20 kHz which is known as audible value. Humans cannot hear inaudible sounds, infrasounds, and ultrasounds.
Sound is a wave that moves through a medium due to the vibrating of its molecules. As a result, travel always necessitates the use of a material medium.
The range of frequencies that humans or other animals can hear is referred to as the hearing range. The human ear has a perceived frequency range of 20 Hertz to 20 kHz, which is referred to as audible sound. Any frequency less than 20 Hz is referred to as infrasound, and any frequency greater than 20 kHz is referred to as ultrasound. These are unheard sounds.
As a result, we cannot hear inaudible sounds, ultrasonic, or infrared.
Hence, the correct option is 4.

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