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我們『翻轉』了過去，『躍進』至現在
這次我們決定『起飛』，擁抱未來。

What pressure oscillation results from oscillating displacements of atoms ?

• We shall consider plane waves for simplicity. The displacement wave is given by the formula y(x,t) = A cos( k_x x - ω t + φ₀ ) where y(x,t) is a displacement in x of the plane
• Last time we have showed on the board that the displacement wave causes local volume compression/rarification with
• In bulk materials, the volume compression corresponds to pressure increase over the ambient pressure, Δ p = P - P_a as described by bulk modulus B
• B plays the role of spring constant in Hooke's Law, but now for volumetric deformations (strains). Units of bulk modulus are Pascales, as that for pressure. Please browse through Chapter 11.4 for discussion of deformations in bulk materials. 
  Notice the difference with Hooke's law. Here it is the relative change of the volume that is involved, while in Hooke's law we deal with the absolute change in the spring length. 
  

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