Question

.........and.......... are the sounds we cannot hear.​

Answer 1

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Infrasound is the span of low-frequency sounds below 20 Hz that fall below the hearing range of humans. Scientists can measure this sound with a tool called an electret condenser microphone, a type of capacitor microphone designed to eliminate background noise.

Answer 2

Answer:

Infrasound is the span of low-frequency sounds below 20 Hz that fall below the hearing range of humans. ... Scientists can measure this sound with a tool called an electret condenser microphone, a type of capacitor microphone designed to eliminate background noise

Low frequency sounds can be harmful

Human beings are normally able to detect sounds in the range of 20-20,000 Hz and it is well known that sounds within this range can damage the hearing.

Here are just a few sounds most people are missing out on:

Sounds for young people.

As humans age, their hearing changes. Age-related hearing loss, called presbycusis, means that older people can’t hear some high-pitched sounds they would have heard in their youth. Most people over the age of 18 cannot hear the 17,400 hertz tone in the video above.

Ultrasonic finger friction

When you gently rub your thumb and index finger together, the friction creates an ultrasonic signal [PDF]. The action is a useful way to test out the function of a bat detector, which converts ultrasonic sound from bat echolocation into noise humans can hear. In the book Insects Through the Seasons, entomologist Gilbert Waldbauer writes that pet bats can be trained to respond to the sound, and fly toward it.

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