3 ms·

I don't get it. What frequencies are we talking about and what power are capable to interact at this level with human bodies? And wouldn't these impulses intera

I don't get it. What frequencies are we talking about and what power are capable to interact at this level with human bodies? And wouldn't these impulses interact with electronic equipment first and foremost?

eurasiantiger 6y ago
I would guess ultrasonics or low frequency radio waves that are projected from multiple directions to converge on a location where the individual waves amplify each other, likely generating a dissonant lower frequency that resonates with the sensory structures of the human inner ear.
- willis936 6y ago
  Ultrasonic has a wavelength of 100 m - 1 km. Even if there were multiple sources, the peak area should be large. Also, neat frequencies are only made from mixing: a nonlinear operation. Most natural nonlinearities come from exciting resonant modes in objects in the path that absorb/retransmit.
  - guywhocodes 6y ago
    I think you are off about 3-4 order of magnitude. 30kHz is about 1cm in air.
    - willis936 6y ago
      In free space: lambda = c / f lambda = 3E8 [m/s] / 10E3 [1/s] = 3E5 [m] You’d be right for acoustic waves, but we’re not talking about those.
  - dariosalvi78 6y ago
    Maybe it was at hearing frequencies, but then it would have made electronic circuits emit sounds. I just can't figure this out in any reasonable way. There was another theory about ultrasound sounds used as rats repellent which would have created lower frequency sounds due to distortion. I find that one more credible.
    - willis936 6y ago
      Acoustic infrasound also seems like a good candidate. There are actual studies about its effect on humans. Not everyone is affected, but the symptoms of sensitive people are similar. It’s even been weaponized by the US DoD!
lbotos 6y ago
https://www.thetimes.co.uk/article/china-turns-ladakh-battleground-with-india-into-a-microwave-oven-6tlwtrtzz https://www.thetimes.co.uk/article/china-turns-ladakh-battle... dunno, but some sources are saying it's being used more widely, and recently.
- dariosalvi78 6y ago
  That's a very different frequency tho!

eurasiantiger 6y ago

I would guess ultrasonics or low frequency radio waves that are projected from multiple directions to converge on a location where the individual waves amplify each other, likely generating a dissonant lower frequency that resonates with the sensory structures of the human inner ear.

willis936 6y ago
Ultrasonic has a wavelength of 100 m - 1 km. Even if there were multiple sources, the peak area should be large. Also, neat frequencies are only made from mixing: a nonlinear operation. Most natural nonlinearities come from exciting resonant modes in objects in the path that absorb/retransmit.
- guywhocodes 6y ago
  I think you are off about 3-4 order of magnitude. 30kHz is about 1cm in air.
  - willis936 6y ago
    In free space: lambda = c / f lambda = 3E8 [m/s] / 10E3 [1/s] = 3E5 [m] You’d be right for acoustic waves, but we’re not talking about those.
- dariosalvi78 6y ago
  Maybe it was at hearing frequencies, but then it would have made electronic circuits emit sounds. I just can't figure this out in any reasonable way. There was another theory about ultrasound sounds used as rats repellent which would have created lower frequency sounds due to distortion. I find that one more credible.
  - willis936 6y ago
    Acoustic infrasound also seems like a good candidate. There are actual studies about its effect on humans. Not everyone is affected, but the symptoms of sensitive people are similar. It’s even been weaponized by the US DoD!

lbotos 6y ago

https://www.thetimes.co.uk/article/china-turns-ladakh-battleground-with-india-into-a-microwave-oven-6tlwtrtzz https://www.thetimes.co.uk/article/china-turns-ladakh-battle... dunno, but some sources are saying it's being used more widely, and recently.

dariosalvi78 6y ago
That's a very different frequency tho!