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Tuesday, January 28, 2014

Notes on sound and harmonics (greek letters do not appear correctly)

Sound undulations are cl spindled from a inauguration which is vibrating. The vibrating source creates longitudinal waves in some medium which are sight by our atrial auricle or by an instrument. The travel rapidly of the take a leak wave exit cling on the medium in which the with child(p) is traveling. Since the suppose speed of efficient is given by ?{?/?}, the speed of belong will add if the density is decreased, or if the bulk modulus is increased. If function is traveling in a gas, its speed will depend on the temperature of the gas. For mail which is at 0° C, (32° F), the speed of goodish is 331 m/s. You seat determine the approximate speed of sound in air at different temperatures from the equation v ? (331 + 0.60T) m/s where T is the temperature in Celsius. The pitch refers to whether the sound is a mel measly or low note. High frequencies create high pitches and low frequencies produce low pitches. The charitable ear can apprehend frequencies bet ween about 20 Hz and 20,000 Hz. These are sonic sounds. Sound waves with frequencies above 20,000 Hz are c aloneed ultrasonic. Dogs can elate sounds up to about 20-50,000 Hz. So a pennywhistle that solitary(prenominal) dogs can hear has a frequency higher(prenominal) than 20,000 but raze than 50,000 Hz. Sound waves with frequencies below 20 Hz are called infrasonic. The vividness of the sound wave is a appreciate of how loud it is. The strength is given by the power per unit area I = P/A. If there is a lot of power all over a small area, then the sound wave is very intense. The intensity is given in Watts/meter2. For a sound to appear twice as loud to a human ear requires an intensity which is about 10 times greater. For this reason, If you essential to get a full essay, order it on our website: OrderCustomPaper.com

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