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The study of sound should begin with the properties of sound waves Simultaneous with these early studies in acoustics, theoreticians were developing the mathematical theory of waves required for the development of modern physics, including acoustics. There are two basic types of wave, transverse and longitudinal, differentiated by the way in which the wave is propagated.
Sound travels in waves that are disturbances that move through a medium by causing particles to vibrate back and forth. That is, it responds much more efficiently to sounds of very small amplitude than to sounds of very large amplitude. Sound, mechanical disturbance that propagates as a longitudinal wave through a solid, liquid, or gas
A sound wave is generated by a vibrating object
The vibrations cause alternating compressions (regions of crowding) and rarefactions (regions of scarcity) in the particles of the medium. In air at a temperature of 70° f (21° c) sound travels at a speed of 1,129 feet (344 meters) per second This means that it takes sound about five seconds to travel one mile In warmer air sound travels faster
Sound travels even faster through water and solid mediums such as iron and stone. The fundamental mechanism for this propagation is known as huygens’ principle, according to which every point on a wave is a source of spherical waves in its own right In addition to the geometric decrease in intensity caused by the inverse square law, a small part of a sound wave is lost to the air or other medium through various physical processes. Sounds are produced when vibrating objects, such as the plucked string of a guitar, produce pressure pulses of vibrating air molecules, better known as sound waves.
The ear mechanism is able to respond to both very small and very large pressure waves by virtue of being nonlinear
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