The frequencies on which sonar is used vary widely. Human hearing is usually cited as ranging as from 20 cycles per second (Hertz) to 20,000 cycles per second. There are many sonars that use frequencies in the 20 to 20,000 Hertz range. In general, the sonars that are used for short range underwater applications operate on a slightly higher frequency than those that are designed to look over long distances. But there are a lot of sonars which use frequencies far outside the range of human hearing. Medical imaging is the most popular use of sonar. The range of frequencies used by these devices range from 2 million cycles per second to 18 million cycles per second. These frequencies are far above what humans can hear.
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You can use the formula v=fλ where v is velocity (speed), f is frequency, and λ is the wavelength. Thus, you get v=(1000Hz)(1.5m) --> v=1500m/s
Ultrasound is sound which has a frequency higher than that of audible sound.( like radar )ADDED: Not like radar. That uses radio waves, although sonar and radar principles are similar.
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Very high. Not sure you can express it as a probability question though. The actual definition depends on various factors including frequency (wavelength), scanner geometry and performance, scanning speed and geometry, the image-processing, water depth, scattering and absorption, nature of the objects being scanned, etc., but sonar performance is increasing all the time as the manufacturers all seek to produce better instruments than their rivals!