lifehacker Lifehacker Lifehacker Lifehacker Watch out for this sound.Sometimes it causes illness even if you can't hear it

As a result of a Chinese diplomat in China, hearing a "strange sound" in an apartment, he has suffered headaches, nausea and hearing loss.This is very similar to the situation where 24 diplomats in Cuba, in 2016, heard strange sounds and complained of similar symptoms.Is it possible that sounds can cause illness in this way?

The stimulus is more frequency than the volume

It is a well -known fact that loud sounds lead to hearing damage.In addition, it hinders sleep, causes headaches, stress, and high blood pressure.However, it seems that the problem with sound occurs even if it is not loud.In some cases, it can lead to problems even if you can't hear it.

The frequency is more important than the volume.Human ears can hear the sound of 20,000 hertz from 20 Hertz.I can't hear any low frequencies or high sounds than this range.Nevertheless, air vibration is occurring regardless of the hearing, which has various effects on the body.In this article, let's look at such ultrasonic and ultra -low frequency sounds.

What is the impact of ultrasound on the human body?

Ultrasound refers to a sound that exceeds 20,000 Hertz, which is the upper limit of human hearing.Ultrasound is used for dog flute, insect repellent inserts, and bats of bats.In the medical field, it is also used for image diagnosis, such as when looking at a pregnant fetus.

So, does ultrasound bring illness?There have been some evidence that a quick vibration (or resonance) heats the tissue when a device that emits ultrasonic waves is pressed against the human body.However, it is not a big impact.The sound is rapidly attenuated when propagating air, water, and other substances.Therefore, it is unlikely that it will penetrate the human body and cause problems.This can be seen from the fact that the US military, who was studying weapons using ultrasonic waves, is unreasonable.

If you are a young man who has not heard, the ultrasound can be heard slightly and it feels a little annoying.But that's it.It is known that the dentures are often heard with ultrasonic insect repellent, but they will eventually return.In other words, the culprit who caused a problem in China and Cuba is unlikely to be an ultrasonic wave.

Ultra -low frequency sounds on the human body

On the other hand, the ultra -low frequency sound is less than 20 Hertz, which is lower than the heavy bass.In nature, it is generated by earthquakes, lightning, marine waves, and some animals.It is known that elephants, whales, hippos, rhinos, giraffes, crocodile, etc. are communicated with ultra low frequency sounds.The CORNELL LAB site allows you to test whether you can hear the elephant's ultra -low frequency sound.

There is also an artificial ultra -low frequency sound.It is known to cause serious symptoms such as headache, dizziness, frustration, fatigue, tinnitus, palpitations, and pressure on the abdomen.It is not unusual for people who are exposed to ultra -low frequency sounds to complain of nausea.Considering that the word "noise" comes from the Latin "nausea" (nausea), there is something interesting.

All of these are characterized by the long wavelengths of ultra -low frequency sounds, reaching farther, tending to bend, and permeating the human body.According to the Popular Science Seth S. HOROWITZ, the sound is expanded and contracted by the sound creates a pressure vibration system and vibrates liquids and gases in the body, such as liquids in the eyes and gas in the lungs.increase.The paper listed in "The Journal of the Acoustical Society of America" explains the problem caused by such vibration.

Everyone has experienced ultra -low frequency sounds without knowing.For example, in horror movies and haunted houses, we use ultra -low frequency sounds called "fear frequencies" for a long time to expand our customers' anxiety, tension, and fear.

The fear frequency is less than 20 Hertz, usually around 17 Hertz.But you won't even notice that it sounds unless you hear a loud volume with headphones or speakers.

In summary, the sound can cause "illness" or at least a malfunction.It occurs when it is always exposed to a loudly low -volume sound, such as a large ship's engine room, a huge wind turbine, or a haunted house using fear frequency.Also, because mischievous goods such as "Sonic Nausea" are also sold, it may be used by someone.

PATRICK ALLAN -Lifehacker US [Original]

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