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Sonar.
'Sonar". And determines depth. The ocean floor topography can be mapped by 'sonar scanning'.
A measure of length, containing six feet; the space to which a man can extend his arms; -- used chiefly in measuring cables, cordage, and the depth of navigable water by soundings., The measure or extant of one's capacity; depth, as of intellect; profundity; reach; penetration., To encompass with the arms extended or encircling; to measure by throwing the arms about; to span., The measure by a sounding line; especially, to sound the depth of; to penetrate, measure, and comprehend; to get to the bottom of.
A uterine sound measures uterine depth.
Simply by measuring the time it takes for the sonar 'ping' to return to the device that sent it. The speed of sound is constant - and dividing the time by the speed of sound gives the distance !
Hertz is used to measure sound frequency (how high or low the sound is). Decibels are used to measure how loud or soft a sound is.
The amplitude of a sound wave is the measure of the intensity of the sound, such as loudness.
an oscilloscope is used to measure sound waves
to measure sound from distance use decibels
It makes the sound travel further
600 ft
sonar