Physics, 11.07.2019 18:30 fyegirl12

Asound 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?

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Asound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far b...