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www.reference.com/article/dog-whistle-work-af8f6fe8b8bd4770

Dog whistles exploit the difference between the hearing range of a dog and that of a human. They use a pitch that is too high for humans to hear but is high enough for dogs to hear. Longer whistles have lower pitches, so in order to get a higher sound, dog whistles use ...

www.reference.com/article/approximate-frequency-used-ultrasonic-dog-whistle-7bbaa7ecd75827a4

The frequency for ultrasonic dog whistles can range from 23 to 54 kilohertz. There are a variety of different dog whistle types, depending on training needs. Depending on the dog's breed, age and size, it may have various hearing capabilities, ranging from 40 to 60 kilo...

www.reference.com/article/whistle-20ac5a7895a0b5d5

To whistle, moisten your lips and say “ooh." Hold the tongue back, and gently blow a constant stream of air through your pursed lips. Adjust the position of your lips, and repeat the process until you create a whistling note.

www.reference.com/article/cat-whistle-bc24a0a6731480b0

A cat whistle is a high-pitched whistle used for training a cat not to misbehave. However, using a cat whistle too often can also cause the cat undue stress.

www.reference.com/world-view/people-whistle-ca7ac6ede598c2b3

A study carried out at the University of Chicago surmised that people whistle to distract the brain from overload. This suggestion came from a study into the phenomenon of choking carried out by a leading Psychologist Dr Sian Beilock.

www.reference.com/world-view/make-silent-dog-whistle-e46eb9f2eff71874

Silent dog whistles can be made from carving willow branches. The branch used should be about 3/4 inch thick and 8 to 10 inches long, cut at an angle.

www.reference.com/world-view/toilet-whistle-1f85e58af6a489a0

A whistling toilet is caused when the fill valve does not shut completely. If there is a gap, water leaks into the tank, causing the valve to vibrate. This is often caused by a dry or deteriorated ballcock valve.