3 ms·

There's a huge difference between medical imaging ultrasound at 25 MHz, and bat night-vision ultrasound at 200 KHz.

• pvaldes 6y ago
  Fair point. And there is a difference also between one bat and a thousand bats clicking at the same time in a colony and overlapping the calls. Either the singing is perfectly synchronised or those 0,2MHz would be higher. If the claimed effect is real then, hypothetically, the bigger the colony the less virus that we should find on it. This may happen or not. I don't have this data. Nobody studied it still from this point of view (If I'm not wrong).
  • dTal 6y ago
    ...not really, no. The supposed mechanism of action here is resonance. You can't generate energy in the 25Mhz range by overlapping a bunch of 200Khz tones, any more than a crowd of humans can generate ultrasound by yelling.