sound of dolphins

To understand how they can use sound humans and animals, we must know that sound waves can be diverted and reflect. Remembering the compression and expansion experienced by the alternately sound passing through any element, air or water, we are prepared to incorporate a new concept: the wavelength. If we measure the distance between compression and the next, this distance is called wavelength. The higher the frequency, the smaller the wavelength. Since we know the speed of sound in different materials, knowing the frequency of the sound we can calculate its wavelength. An object which is large compared to the wavelength of reflected sound much of this sound. These reflexes are called echo. The sounds surround the objects that are small compared with wavelength. The fact that objects reflect sound has been exploited by man in the navigation to locate icebergs or background in commercial fishing to find large schools of fish, and military operations to determine the location of submarines. We know that materials of different densities reflect sound, therefore, in the ocean the sound bounces off the surface and bottom water masses of different temperatures, together with the animals and plants. The layers of water have different temperatures deviate from the sound waves that are not reflected. Thus, a sound wave that travels the sea expands, is absorbed, changes direction, is reflected and dispersed. The higher the sound frequency, the greater the effect. For this reason, most echo probes that use long range boats operating at a frequency below 5,000 Hz to detect small objects at distances much smaller, sonars operate at a frequency beyond the hearing range of man, ie above 20,000 Hz