The speed of sound in air is low, because air is easily compressible. This observation is analogous to the fact that the frequency of a simple harmonic motion is inversely proportional to m, the mass of the oscillating object. The greater the density of a medium, the slower the speed of sound. This observation is analogous to the fact that the frequency of simple harmonic motion is directly proportional to the stiffness of the oscillating object as measured by k, the spring constant. In general, the more rigid (or less compressible) the medium, the faster the speed of sound. Is the absolute temperature in kelvins, and M is the molecular mass.
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