Sound Wave Essay

394 WordsJul 20, 20122 Pages
A sound wave is a type of pressure wave caused by the vibration of an object in a conductive medium such as air. When the object vibrates, it sends a series of waves that can be interpreted as sound. For example, when someone hits a drum, causes the membrane of the drum to vibrate, and vibration is transmitted through the air, where it can reach the ear of a listener. Not all sound waves are in the audible range. Humans hear about 12 Hz to 20 kHz, which means that sounds above and below this range usually cannot be heard, and some animals can hear in the upper and lower ranges. Some sound waves as transverse waves move, moving outward in a pattern wave classics from the sound source. The wave motion is perpendicular, and may be compared to a rock dropping into water and observing the effect of ripple outward. May also be in the form of longitudinal waves, which is horizontal motion, creating compression zones alternating in the medium to generate sound. Like other waves, a sound wave can be described in a number of ways. For example, the frequency of a sound wave is a term used to describe the number of complete cycles within a period of time, expressed in Hz or hertz. In the case of hertz, the frequency is expressed in cycles per second. The greater the number of cycles, the larger the pitch. Another characteristic of the sound waves that may be important is the wavelength. The wavelength of a sound wave is described as the distance needed for a full cycle to be completed. A complete cycle movements from peak to peak or trough to trough of a sound wave. The wavelengths are directly related to both the speed of sound wave and frequency. Sound waves have a number of traits that make them attractive to humans. You can travel through almost any medium, including gases, solids and liquids, but cannot travel in a vacuum. This means that the space is quiet, because there

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