The number of pressure variations per second is called the frequency of sound, and is measured in Hertz (Hz) which is defined as cycles per second When sound travels through air, the atmospheric pressure varies periodically. Noise is unwanted sound Sound is the quickly varying pressure wave traveling through a medium. NOISE Apart from musical instruments, sound can be produced by many other sources – man's vocal cord, a running engine, a vibrating loudspeaker diaphragm, an operating machine tool, and so on. Sound can also travel through other media, such as water or steel. A person nearby may then hear the sound of the guitar when the pressure waves are perceived by the ear. When one plays a musical instrument, say a guitar, the vibrating chords set air particles into vibration and generate pressure waves in the air. NOISE Sound is a form of energy that is transmitted by pressure variations which the human ear can detect.
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