On vibrating eyeballs, ghosts, and the strange science of infrasound
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- čas přidán 27. 09. 2012
- Mike Goldsmith, popular science author and former head of acoustics at the UK's National Physical Laboratory, talks about one of the weirdest areas of sound science. ukcatalogue.oup.com/product/97...
- Věda a technologie
Interesting, but isn't it a given that sounds too low to hear can still be felt, and thus have a physical effect?
Infrasond: low frequency sound below human hearing spectrum, you can barely hear it.
Anybody else think he played infrasound throughout the video?
Thx for the info
What is the difference between "infrasound" and "subsonic"?
Isn't "subsonic" just beneath the audible range ?
Subsonic refers to the speed sounds travels. In the air, sound travels around 340.29 m/s. Speeds below that (traveling in the same medium) are subsonic. Speeds above are called supersonic. Aircraft that are capable of supersonic travel have a top speed often measured in mach, which takes in to account both pressure and the medium being traveled in. Mach 1 is right around the speed of sound. Hypersonic speeds are around 5-10 mach, and 10-25 mach for high hypersonic, and re-entry speeds (such as a space shuttle returning to Earth) can reach higher than 25 mach, or about 8,500 m/s. That varies based on medium and pressure, but is generally in there.
Infra sound is obviously beneath the audible range. A human can hear relatively low frequencies compared to some animals. Dolphins have a massive range of 75 hertz to 150,000 Hz, while humans hear from about 20-20,000 Hz. An adult male typically speaks from 85-180 Hz, while adult females speak around 165-255 Hz.
Oh, this voice is almost infrasonic! Just a joke.
Agreed, I can't hear him, but I can feel him... No homo