The Nature of Light and Colour in the Open Air (Dover Books

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Air is a gas, and a very important property of any gas is the speed of sound through the gas. Reflection - waves reflect partially when resistance of medium increases. The magnitude of this fluctuation from equilibrium is known as the amplitude of the sound wave; measured in pascals, or newtons per square metre, it is represented by the letter A. Indeed, its presence, regardless of the pitch, the particular vowel and the dynamic level, has come to be considered a criterion of quality: the extra peak has been designated the "singing formant."

Pages: 416

Publisher: Dover Publications; Revised ed. edition (June 1, 1954)

ISBN: 0486201961

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