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Sound
Why Sound Moves Faster in Dense Materials
Description
Sound moves faster in solids and liquids because their particles are close together and can pass along disturbances quickly. Most solids and liquids are incompressible, which means their densities stay nearly constant throughout. When an external force acts on them, the molecules try to return to their original positions. Th...
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Transcript
固体和液体不易被压缩。当声波使这些介质中的组成粒子发生位移时,由于粒子间的相互作用力,粒子会倾向于恢复到原始位置。
请记住,声音是一种压力波。它通过介质传播时,介质中的粒子会在其平衡位置附近振动,并将能量传递给邻近的粒子。
如果介质中的组成粒子质量较大,则更难将其恢复到原始位置。因此,当介质的组成粒子较重时,声音在其中的传播速度较低。
综合这些概念,固体和液体中的声速由相应介质的弹性模量除以密度的平方根给出。
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