Resonance
RESONANCE: " The property whereby any vibratory system responds with maximum amplitude to an applied force having the a frequency equal to its own."
In english, this means that any solid object that is struck with a sound wave of equal sound wave vibrations will amplitude the given tone. This would explain the reason why some singers are able to break wine glasses with their voice. The vibrations build up enough to shatter the glass. This is called
RESONANCE.
Resonance can be observed on a tube with one end open. Musical tones can be produces by vibrating columns of air. When air is blown across the top of the open end of a tube, a wave compression passes along the tube. When it reaches the closed end, it is reflected. The molecules of reflected air meet the molecules of oncoming air forming a node at the closed end. When the air reaches the open end, the reflected compression wave becomes a rarefaction. It bounces back through the tube to the closed end, where it is reflected. the wave has now completed a single cycle. It has passed through the tube four times making the closed tube, one fourth the length of a sound wave. By a continuous sound frequency, standing waves are produced in the tube. This creates a pure tone. We can use this knowledge of one fourth wavelength to create our own demonstration. It does not only have to be done using wind, but can also be demonstrated using tuning forks. If the frequency of the tuning forks is known, then v=f(wavelength) can find you the length of your air column.
Using a tuning fork of frequency 512 c/s, and the speed of sound is
332+0.6T m/s, temperature being, 22 degrees, substitute into the formula.
Calculate 1/4 wavelength
V=f(wavelength)
wavelength=V/f
=345.2 (m/s) / 512 (c/s)
=0.674 m/c
1/4 wave. =0.674 (m/c) / 4
= 0.168 m/c
Therefore the pure tone of a tuning fork with frequency 512 c/s in a temperature of 22 degrees would be 16.8 cm. The pure tone is C.
If this was done with other tuning forks with frequencies of 480, 426.7,
384, 341.3, 320, 288, and 256 c/s then a scale in the key of C would be produced.
There are many applications of this in nature. One example of this would be the human voice. Our vocal chords create sound waves with a given frequency, just like the tuning fork.
One of the first applications of the wind instrument was done in ancient
Greece where the pipes of pan were created.
Stethoscope functionality generally has not changed over the past few decades evolving from the monaural hollowed out wooden tube first invented in the early 1800’s by Rene Laennec to the more familiar long multi tubular version, improved upon by George Cammann 50 years later, we so typically see today. The core components of a modern stethoscope are comprised of ear tips, binaural piece, tubing and a diaphragm with a bell on the back. The bell transmits low frequency waves all the way up to the ear pieces, while the diaphragm is designed to carry the higher frequency sound. The two fathers of the stethoscope left little room for improvement on the near perfect design for just over a century until a Harvard Medical School professor by the name of David Littmann turned the simple listening device into the versatile diagnostic tool resting around almost every health care professional’s neck today.
It was proposed that if the length of the PVC pipes were to increase, then the sound produced will have a lower amplitude each time because the sound will lose energy as it continues in the pipe for a certain amount of time. However, the data actually showed that with every increase in pipe length, the amplitude got louder as well, thus refuting the hypothesis. These results made sense because what was created inside the PVC pipes was a standing still sound wave, or a resonance wave. These kinds of waves have certain locations on its wavelength in order for the change in sound to be heard, which it usually half a wavelength. With this, the tuning fork is 83.3Hz and a usual wavelength is about 300Hz, 300/83.3 = 3.6 meters, which is about 4 meters (half = 2 meters). So for the change in sound to be heard, the pipes had to be about 2 meters in change according to the frequency of the tuning
than 9 square centimeters, was placed on the patient's chest at various angles. The transducer delivered ultrasound waves into the body and these
As a part of this longitudinal sound wave, the particles vibrate back and forth in a direction parallel to the direction of energy. Since the air molecules always return to their original position, they have no net displacement. When the vibrating molecules of air have to escape somewhere, this is where the sound hole comes into play. The air escapes through it and this is where the sound is projected. When all this occurs, it’s called the Helmholtz resonance (Wolfe).
note. Most notes have reverb on them to give a transient to the sound to make it sound wet and
In general, ultrasound waves produced by an instrument called transducer are sent into a patient. Some of the waves are absorbed, but the other portion of these waves are reflected when tissue and organ boundaries are encountered. The echoes produced by the reflected waves are then picked up by the transducer and translated in a visible picture often referred to as ultrasound. In the paragraphs that follow, the physics of how the transducer functions, what the ultrasound waves do, and how the image is formed will be explained.
is the Kelvin scale. On the Kelvin scale absolute zero has a value of zero
"The Physics Of Guitar." The Physics Of Guitar. N.p., n.d. Web. 26 May 2014. .
The Scholar: I think that's more a function of sound wave vibration than anything else.
In everyday life, there are things that one needs to survive. And sustainability problems arise every day. One such problem is energy loss. The world is using up a lot of energy and new ideas need to be formed to help the rest of the world and the future of the generations that are to follow, to survive. With that the problem is that people use up energy and they do not use it efficiently. Therefore scientists are needed to find ways to deal with the sustainability problem that is arising. That is where wind turbines are used to generate this energy but the actual wind-turbines are very large, loud and they kill birds, thus new designs need to be found in order to help energy usage and to bring the size and structure of the wind turbines to a smaller scale to prevent injuries to nature and the species around it.
often done by electrical discharge in a pure gas - or gas mixture - in a tube.
Sound is essentially a wave produced by a vibrating source. This compression and rarefaction of matter will transfer to the surrounding particles, for instance air molecules. Rhythmic variations in air pressure are therefore created which are detected by the ear and perceived as sound. The frequency of a sound wave is the number of these oscillations that passes through a given point each second. It is the compression of the medium particles that actually constitute a sound wave, and which classifies it as longitudinal. As opposed to transverse waves (eg. light waves), in which case the particles move perpendicular to the direction of the wave movement, the medium particles are moving in the same or opposite direction as the wave (Russell, D. A., 1998).