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Radius with the device in the center of the circle. So the device has an effective range of 5 feet. Sound pressure varies inversely with the square of the distance, so if you put the unit in the corner of a 10 ft. They normally work at a frequency between 28 and 50 kHz. The pressure and vacuum waves in the liquid cause the phenomenon known as "ultrasonic cavitation". We use ultrasound and an appropriate cleaning solution to clean delicate items.
Just like other types of devices that use radio waves to communicate, a wireless mouse signal can pass through barriers such as a desk or your monitor. RF technology provides a number of additional benefits for wireless mice. These include: RF transmitters require low power and can run on batteries RF components are inexpensive RF components are light weight As with most mice on the market today, wireless mice use optical sensor technology rather than the earlier track ball system.
The reason that this product effectively eliminates pests is because of technology inside that emits electronic rodent repellent. These sound waves will not bother the people in the house at all, but it is just the right pitch to drive insects crazy. The pitch is even at the right level frequency that pets will not be bothered either..
They are also used besides ordinary sounds in sonars to detect underwater objects due to the fact that they propagates underwater with small attenuation and are reflected by solid objects. Sonars uses a wide pressure waves band, formed both by audible sounds and by ultrasounds. Audible sounds have a smaller attenuation, but identify objects position with a smaller accuracy.