A common use of ultrasound is in underwater vary discovering; this use can also be called Sonar. An ultrasonic pulse is generated in a selected course. If there may be an object within the path of this pulse, half or all the pulse will be reflected again to the transmitter as an echo and may be detected by way of the receiver path.
A dog whistle is a whistle that emits ultrasound, used for coaching and calling dogs. The frequency of most canine whistles is within the vary of 23 to 54 kHz. The upper frequency restrict in humans (approximately 20 kHz) is because of limitations of the center ear.
In air at atmospheric pressure, ultrasonic waves have wavelengths of 1.9 cm or much less.
Toothed whales, together with dolphins, can hear ultrasound and use such sounds of their navigational system (biosonar) to orient and to capture prey. Porpoises have … Read MoreRead More »