The book A Text book of the Principles of Physics was written by author Alfred Daniell Here you can read free online of A Text book of the Principles of Physics book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text book of the Principles of Physics a good or bad book?
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If the particles all lay in straight lines, the speed of propagation of sound would be the * See Tolver Preston, Phil Mag, iii (1877). Digitized by VjOOQIC I 430 ON SOUND. [chap. average speed at which the particles move ; just as the rate of propagation of a message by couriers would be the average rate at which they ride. Nothing would be gained in point of speed by multiplying the number of such couriers if their horses were not susceptible to fatigue ; and so it is a matter of in- differenc...e what the number of molecules is by the intervention of which the exchange and transmission of energy are effected, provided always that the coUisions of the molecules occupy time inappreciable in comparison with the intervals spent by them in traversing their free paths, and further that the size of the molecules be very small in comparison with the average length of the free path. Thus the velocity of sound does not depend, within the same gas, upon the density or on the pressure. If the speed be changed, the case is different ; an increased average speed causes an increased velocity of propagation.
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