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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/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/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/velocity-wave-wavelength-30-meters-frequency-12-hz-9e174d97153ca4b4

The formula for finding the velocity of a wave is to multiply its wavelength by its frequency. In this case, 30 m x 12 Hz = 360 meters per second.

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/science/difference-between-50-hz-60-hz-3fed1f0d5b216af1

According to Britannica, hertz are units of frequency, so 50 Hz contains less frequency than 60 Hz. These units are used to calculate electric currents, electromagnetic waves and sound.

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.