3 or 4 miles away.
dog
the object isn't vibrating in a range for humans to hear.
"no because a dog whistles frequency is so high that no person can hear it no matter how hard you blow" You could possibly hear some sound... most dog whistles work in the range of 16-22 kHz and the human hearing range tops out around 20kHz so if your hearing is very good it may be possible to hear the whistle's lower frequencies.
We can not hear dog whistles because they are far too high pitch (they are out of our hearing range). However, dogs can hear this and they respond to it as if it was a regular whistle, returning to their owner or turning their attention back to the owner. Dog whistles are also designed not to annoy other people.
yes. But you have to train the dog to stop barking using a dog whistle first. I don't know how to do that as I'm not a proffesinal dog trainer.
There is a dog whistle that only dogs can hear because they can hear higher frequencies than humans. However, it has been found that both dogs and kids can hear, but adults can't. This is because as people age, they are not able to hear sounds above a certain frequency. The pitch, in other words, is too high for them. Being able to hear a dog whislte only means that you can hear higher frequencies.
No, while a dog can hear ultrasound frequencies up to about 45KHz (normal human hearing is only up to about 20KHz) the frequencies made by ultrasound imaging machines are usually in the MHz range, far beyond a dog's hearing range.
Typically, a dog whistle is within the range of 16000Hz to 22000 Hz. Some dog whistles have adjustable sliders for active control of the frequency produced.
Yes.
how wide a range of vibrations can hear
the fact is that dog ears have a large variety in which they could hear better
the range of sound frequencies that humans can hear is about0to200Hz