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The speed of sound may also be written in terms of the isentropic bulk modulus as

  • A.The square root of the density divided by the bulk modulus
  • B.The bulk modulus divided by the density
  • C.The product of the bulk modulus and the density
  • D.The square root of the bulk modulus divided by the density

Answer: D

The general result for any medium is the square root of the isentropic bulk modulus over the density. For a perfect gas the bulk modulus is the specific heat ratio times the pressure, and substituting the equation of state recovers the familiar temperature-only form. The general expression is what applies to liquids and solids.

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