enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Physics of whistles - Wikipedia

   en.wikipedia.org/wiki/Physics_of_whistles

   With a frequency near 2800 Hz the interior rotation rate must be very high. It is likely that the Rossby number U /( fD ) would be a valuable dynamic similarity number. The Boatswain's pipe is similar to the police whistle, except that the cavity is spherical, creating a more complex vortex.

3. Dog whistle - Wikipedia

   en.wikipedia.org/wiki/Dog_whistle

   [3] [4] It is thought that the wild ancestors of cats and dogs evolved this higher hearing range in order to hear high-frequency sounds made by their preferred prey, small rodents. [3] The frequency of most dog whistles is within the range of 23 to 54 kHz, [ 5 ] so they are above the range of human hearing, although some are adjustable down ...

4. Steam whistle - Wikipedia

   en.wikipedia.org/wiki/Steam_whistle

   Unlike a conventional whistle, the diameter (and sound level) of a ring-shaped whistle can be increased without altering resonance chamber cross-sectional area (preserving frequency), allowing construction of a very large diameter high frequency whistle. The frequency of a conventional whistle declines as diameter is increased.

5. Ultrasound - Wikipedia

   en.wikipedia.org/wiki/Ultrasound

   [23] [24] The wild ancestors of cats and dogs evolved this higher hearing range to hear high-frequency sounds made by their preferred prey, small rodents. [23] A dog whistle is a whistle that emits ultrasound, used for training and calling dogs. The frequency of most dog whistles is within the range of 23 to 54 kHz. [25]

6. Hearing range - Wikipedia

   en.wikipedia.org/wiki/Hearing_range

   As dogs hear higher frequency sounds than humans, they have a different acoustic perception of the world. [24] Sounds that seem loud to humans often emit high-frequency tones that can scare away dogs. Whistles which emit ultrasonic sound, called dog whistles, are used in dog training, as a dog will respond much better to such levels. In the ...

7. Animal repellent - Wikipedia

   en.wikipedia.org/wiki/Animal_repellent

   High-frequency whistles are used on vehicles to drive deer away from highways, and similar devices are used to deter certain types of insects or rodents. Repellents of this kind for domestic cats and dogs include ultrasonic devices which emit a high-frequency noise that does not affect humans. These types of non-chemical repellents are ...

8. Lisp - Wikipedia

   en.wikipedia.org/wiki/Lisp

   A strident lisp results in a high-frequency whistle or hissing sound caused by stream passing between the tongue and the hard surface. In the extensions to the IPA, whistled sibilants are transcribed [s͎] and [z͎].

9. Whistle - Wikipedia

   en.wikipedia.org/wiki/Whistle

   A party whistle A metal pea whistle. A whistle is a musical instrument which produces sound from a stream of gas, most commonly air. It may be mouth-operated, or powered by air pressure, steam, or other means. Whistles vary in size from a small slide whistle or nose flute type to a large multi-piped church organ.