a sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below…

a sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the earth’s surface. what has the sound wave most likely encountered? a different kind of rock an underground lake an open cavity a pile of dinosaur bones

a sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the earth’s surface. what has the sound wave most likely encountered? a different kind of rock an underground lake an open cavity a pile of dinosaur bones

Answer

Brief Explanations:

Sound waves travel at different speeds through different media. Water (as in an underground lake) has a lower sound - wave speed compared to many rocks. An open cavity would cause reflection and other complex behaviors rather than a simple speed - decrease. Dinosaur bones are not common near the Earth's surface and would not cause such a significant speed change. Different rocks can have different densities and elastic properties, but the significant speed decrease is more characteristic of a transition to a liquid medium like water in an underground lake.

Answer:

an underground lake