Anomalous transparency of water-air interface for low-frequency sound.

  title={Anomalous transparency of water-air interface for low-frequency sound.},
  author={Oleg A. Godin},
  journal={Physical review letters},
  volume={97 16},
Sound transmission through a water-air interface is normally weak because of a strong mass density contrast. We show that the transparency of the interface increases dramatically at low frequencies. Almost all acoustic energy emitted by a sufficiently shallow monopole source under water is predicted to be radiated into air. Increased transparency at lower frequencies is due to the increasing role of inhomogeneous waves. For sources symmetric with respect to a horizontal plane, transparency is… CONTINUE READING
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