Question: When sound waves are studied deep within the ocean, it is found that a plane wave that is initially parallel to the ocean floor will

When sound waves are studied deep within the ocean, it is found that a plane wave that is initially parallel to the ocean floor will gradually bend upward and have a propagation direction that is tilted slightly toward the surface (Fig. P12.45). Does the speed of sound at these depths increase or decrease as one goes deeper within the ocean?

Figure P12.45

Water surface Ocean floor

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