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www.britannica.com/science/sound-physics

... such as those that are produced by dog whistles or by sonar equipment. Sound ... A wave of single frequency would be heard as a pure sound such as that ... The frequency and ...

thehappypuppysite.com/best-dog-whistles

Jul 4, 2018 ... Especially when you link the sound of the clicker or the dog whistle with ... The silent whistle sounds at a frequency level beyond the range of ...

www.pasco.com/products/guides/sound-waves

In physics, sound is produced in the form of a pressure wave. ... This is because dog whistles produce sound waves that are below the human hearing range of 20 ... Pitch can only...

premiumpetware.co.nz/product/high-frequency-dog-whistle

Tuneable Whistle That Targets Frequencies Only Dogs Can Hear. Please note that the whistle is not silent. Humans still hear some noise depending on the pitch  ...

digscholarship.unco.edu/cgi/viewcontent.cgi?article=1212&context=urj

noise exposure their dogs face and if their hearing is affected as a result, I created a survey for dog owners in ... occur is called the frequency and is measured in.

www.quora.com/Do-dog-whistles-hurt-the-dogs-hearing

A sound is however harmful if it's too loud, i.e. if it's very strong and/or too close to the ear, regardless of the frequency. Since you can't hear a dog whistle ...

www.walterreeves.com/insects-and-animals/ultrasonic-devices-not-for-bird-control

High frequency dog whistles work because dogs can hear sounds up to 40-60 kHz. ... Even birds like oilbirds and swiftlets that are known to use sound for ...

www.psychologytoday.com/us/blog/canine-corner/201511/are-silent-dog-whistles-useful

Nov 12, 2015 ... He found that dogs could hear high-pitched sounds that were well beyond human hearing ability. Thus the maximum upper sound frequency ...

www.greatpetcare.com/dog-behavior/12-noises-that-freak-dogs-out

Read below to find out why a fear of loud noises is so common in dogs, how to ... online that were specifically developed to produce calming effects in dogs.

en.wikipedia.org/wiki/The_Mosquito

The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard ...