PPT14 - Sound and Fury The time sequence of alternating...

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Sound and Fury The time sequence of alternating dense-thin regions of air from the vibrations of the arm of a tuning fork constitutes a traveling longitudinal wave which is registered by our bodies as sound. Needs a medium to propagate. But has properties similar to light . These waves, you may recall, satisfy the relation v = f . λ (velocity/speed = frequency x wavelength) The speed of sound through air at room temp . is 1100 ft/s or 330 m/s . λ
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Sound Effects Sound waves, unlike light, require a medium to carry them. Thus it is entirely logical to expect that the speed of sound will depend upon the medium. In nature for various media , it is found that the speed increases in this order, in general, gas-> liquid/fluid-> solids Thus, sound travels faster through water (1500 m/s) and steel (6000 m/s) than through air (330 m/s), exactly opposite the behavior of light . Ever wonder why, in old movies, the cowboy puts his ear to the rail to find out if a train is coming? All things being equal and in the same kind of medium - say a gas - sound speed decreases with increasing density , exactly as light but against the order as you cross media. An indication of the “ orneriness ” of sound! It follows then that as a gas gets hotter, sound travels faster in it.
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Sound Effects II For every degree rise in temp. in air (and thus a drop in
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PPT14 - Sound and Fury The time sequence of alternating...

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