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sound, doppler effect - Coggle Diagram
sound
sources of sound
resonance
When the frequency of a forced vibration matches the object’s natural frequency, a dramatic increase in amplitude occurs.
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air columns
open end
frequency f for n harmonic number is f=nf1 where n is 1,2,3,...f1 is the frequency of fundamental f1=v/2L
closed end
frequency of f for n harmonic is f=(2n+1)f1 , where n is 0,1,2,... and fundamwental is f1=v/4L
vibration strings
frequency f for n harmonic number is f=nf1 where n is 1,2,3.... f1 is the frequency of fundamental f1= v/2L
noise
Noise is unwanted sound considered unpleasant, loud or disruptive to hearing. From a physics standpoint, noise is indistinguishable from desired sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound
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Most pieces of music set up a limited amount of dissonance on purpose, and then resolve it to a consonant conclusion.
The (sometimes unconscious) sense of relief we feel is part of the experience of listening to music.
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Any time a source exceeds the speed of the wave, a shock wave will be formed.If a jet exceeds the speed of sound, it produces a loud sonic boom
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beats
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a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies
applications
sonar
Sonar (sound navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels
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ultrasound
Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz (20,000 hertz) in healthy young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
Medical ultrasound is an ultrasound-based diagnostic medical imaging technique used to visualize muscles, tendons, and many internal organs to capture their size, structure and any pathological lesions with real time tomographic images.
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inteference of sound
When two or more sound waves occupy the same space, they affect one another. The waves do not bounce off of each, but they move through each other. Two identical sound waves can add constructively or destructively to give different results
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