⭐⭐⭐⭐⭐ The Sound Of Waves

Thursday, December 30, 2021 9:12:26 AM

The Sound Of Waves

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Sound waves exist as variations of pressure in a medium such as air. They are created by the vibration of an object, which causes the air surrounding it to vibrate. The vibrating air then causes the human eardrum to vibrate, which the brain interprets as sound. The illustration on the left shows a speaker creating sound waves click the button to show animation.

Sound waves travel through air in much the same way as water waves travel through water. In fact, since water waves are easy to see and understand, they are often used as an analogy to illustrate how sound waves behave. Sound waves can also be shown in a standard x vs y graph, as shown here. This allows us to visualise and work with waves from a mathematical point of view. The resulting curves are known as the "waveform" i. The wave shown here represents a constant tone at a set frequency.

You will have heard this noise being used as a test or identification signal. This "test tone" creates a nice smooth wave which is ideal for technical purposes. Since a sound wave consists of a repeating pattern of high-pressure and low-pressure regions moving through a medium, it is sometimes referred to as a pressure wave. If a detector, whether it is the human ear or a man-made instrument, were used to detect a sound wave, it would detect fluctuations in pressure as the sound wave impinges upon the detecting device.

At one instant in time, the detector would detect a high pressure; this would correspond to the arrival of a compression at the detector site. At the next instant in time, the detector might detect normal pressure. And then finally a low pressure would be detected, corresponding to the arrival of a rarefaction at the detector site. The fluctuations in pressure as detected by the detector occur at periodic and regular time intervals. In fact, a plot of pressure versus time would appear as a sine curve. The peak points of the sine curve correspond to compressions; the low points correspond to rarefactions; and the "zero points" correspond to the pressure that the air would have if there were no disturbance moving through it.

The diagram below depicts the correspondence between the longitudinal nature of a sound wave in air and the pressure-time fluctuations that it creates at a fixed detector location. The above diagram can be somewhat misleading if you are not careful. The representation of sound by a sine wave is merely an attempt to illustrate the sinusoidal nature of the pressure-time fluctuations. Do not conclude that sound is a transverse wave that has crests and troughs.

Sound waves traveling through air are indeed longitudinal waves with compressions and rarefactions. As sound passes through air or any fluid medium , the particles of air do not vibrate in a transverse manner. Waves can be measured in a range of different ways: by their amplitude, wavelength, frequency, speed, and, at times, their phase. Amplitude is a metric method associated with hearing.

It is commonly grouped with intensity, loudness, and or volume. The wavelength is easy enough to detect, you simply note, during one complete wave cycle, the distance a disturbance travels through the medium in one complete wave cycle. Once every wave cycle, a wave will repeat its pattern. For this reason, the wavelength is sometimes referred to as the length of the repeating pattern or the length of one complete cycle. In the case of transverse waves, this length is commonly measured from one wave crest to the next adjacent wave crest, or from one wave trough to the next adjacent wave trough.

However, because longitudinal waves do not have crests or troughs, their wavelengths must be measured in a different manner. Thus, because longitudinal waves are comprised of repeating patterns of compressions and rarefactions, their wavelengths can commonly be measured as the distance from one compression to the next compression, or the distance from one rarefaction to the next rarefaction. Sometimes referred to as pressure waves, sound waves encompass repeating patterns of alternating high and low pressure regions moving through a medium.

Typically, in a sound or pressure wave, these alternating fluctuations in pressure occur at regular, set times. If each fluctuation were to be plotted on a grid with pressure and time continuums, the final markings would indicate a sine curve, defined as random x plotted points supported by the consistency of y markings. Lastly, the speed of sound depends upon the type of medium and its state. It is generally affected by two things: elasticity ease with which molecules move or degree to which molecules move away from their neutral position when disturbed and inertia the denser the air or medium, the more inertia the sound wave has.

A sound wave is not a transverse wave with crests and troughs, but rather a longitudinal wave with compressions and rarefactions. These regions of high pressure and low pressure, known respectively as compressions and rarefactions , are established as the result of the vibrations of the sound source. Open Main Menu. Browse Courses My Classes. What Are Sound Waves? Sound waves can be measured according to several different paradigms: amplitude, wavelength, frequency, speed, and, at times, phase.

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