1 (b) A narrow street between the fronts of houses or businesses. 2  This type of alley is found in the older parts of many cities, including American cities like Philadelphia and Boston (see Elfreth's Alley, Philadelphia, Pennsylvania). 3  Many are open to traffic.
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A mechanical wave is a disturbance that pulsates through some form of medium: a solid, a liquid, or a gas, carrying the original, initiating energy from one place to another.There are three types of mechanical waves: transverse, longitudinal, and boundary.or a transverse waves, the amplitude is the distance that the wave displaces the medium. The number of waves passing through the medium over time is the waveâs frequency. The higher the frequency of a mechanical wave, the greater the energy it transmits.