Such phonons propagate in straight lines with unchanging wavelength, frequency and velocity.Sound in, say, a swimming pool or a smoothly flowing river travels straight from its source to the ear.

 
  • 这类声子以固定波长、频率与速度沿直线传播,像声音在游泳池或是平顺流动的河流中,就是从音源一直线传递到我们耳朵。
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