117 This professor bounces sound waves carrying music that can not be heard out loud but can be heard in. (m.youtube.com) posted 1 year ago by GGRockz 1 year ago by GGRockz +117 / -0 43 comments share 43 comments share save hide report block hide replies
From a sound perspective 65KHz is a small wave length, but certainly not to be portrayed with the space between his finger and thumb. That would be closer to microwave.
This explains why all the shooters in these mass shooting say a voice told them to.
Yeah. The wavelength is fairly long - a couple miles long. Unless he was lying about the frequency.
4200 meters.
My bad - we are thinking about RF. Sound in air is different.
Wavelength (λ) = 0.005277 m. Is that 5.2mm?
https://onlinecalculator.guru/physics/wavelength-for-medium-sound-in-air-at-20-degree-celsius-at-frequency-65-khz/
4200 meters per wave length.
Amateur radio 20 M is in the 14Mhz range.
Some of us tend to automatically compute frequency into free space RF wavelengths. Sound in various mediums is totally different.