ACOUSTICS-11newest1-1

# ACOUSTICS-11newest1-1 - ACOUSTICS Sound requires a source...

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CSD 101  1 ACOUSTICS  Sound requires a source and a medium To vibrate, a source must have two properties A) mass (m) B) elasticity (E) To transmit sound, a medium must be capable of being set into vibration To vibrate the medium must have the same two properties A) mass (m) B) elasticity (E)

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CSD 101  2 ACOUSTICS  Mass (m) – 1)The amount of mass present applies 2) Mass contrasted with weight – weight is an attractive gravitational pull; where mass is the quantity of matter present (for example 160 pounds on earth = 27 pounds on the moon because the force of gravity is 6:1 Weight is similar to mass BUT they are different concepts Weight is a force Mass is the quantity of matter present Air has mass and weight
CSD 101  3 ACOUSTICS Elasticity (E) 1) property that enables RECOVERY from distortion of shape and volume 2) The ability to resist changes in shape or volume 3) Concept of “Elastic Limit” if applied force exceeds elastic limit- the distortion is permanent 4) With air, elasticity refers to the tendency of air volume to return to its former volume AFTER compression.

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CSD 101  4 ACOUSTICS 1) VIBRATORY MOTION OF TUNING FORK Strike the fork – vibrations occur The tuning fork tines are moved (displaced) from equilibrium Amplitude of displacement is proportional to the force applied 2) DISPLACEMENT FROM EQUILIBRIUM Newton’s First Law of Motion: INERTIA All bodies remain at rest or in a state of uniform motion unless another force acts in opposition Inertia is the tendency of a body at rest to stay at rest and the of a body in motion to stay in motion Magnitude of inertia is directly proportional to the mass More mass = more inertia Mass is a measure of inertia
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## This note was uploaded on 06/09/2008 for the course CSD 101 taught by Professor Blood,ingridmari during the Summer '07 term at Penn State.

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ACOUSTICS-11newest1-1 - ACOUSTICS Sound requires a source...

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