An enumeration district is a geographic area determined for purposes of taking the census. In one city there may be many enumeration districts, so once you enter a city, county, or state, you can narrow your results by entering street level information, or investigate enumeration district maps, or descriptions.
P wave. 1. a longitudinal earthquake wave that travels through the interior of the earth and is usually the first conspicuous wave to be recorded by a seismograph. Also called primary wave. Compare L wave, S wave. The P wave is admitted to be the wave of auricular contraction. p wave.
A pulse is a wave packet containing broad range of frequencies. A pulse (wave packet) is a localized disturbance that results from the sum of many different wave forms. The wave is the transport of disturbances in space, not associated with motion of the medium occupying this space as a whole.s there is but one pulse, the wave travels through water at velocity v and that one wave's energy compresses and releases water as the wave travels through the water.