What is the term that describes an echo from a sound wave traveling from one medium into another?

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Multiple Choice

What is the term that describes an echo from a sound wave traveling from one medium into another?

Explanation:
When a sound wave reaches the boundary between two media, part of its energy is reflected back into the original medium, producing an echo. This reflected wave is called a sound reflection. The other portion that enters the second medium is transmitted onward. The amount reflected depends on the acoustic impedance mismatch at the boundary, which is why some waves bounce back more than others. Frequency shifts describe Doppler effects, not the echo itself, and wave transmission refers to what passes into the new medium rather than the echoed portion.

When a sound wave reaches the boundary between two media, part of its energy is reflected back into the original medium, producing an echo. This reflected wave is called a sound reflection. The other portion that enters the second medium is transmitted onward. The amount reflected depends on the acoustic impedance mismatch at the boundary, which is why some waves bounce back more than others. Frequency shifts describe Doppler effects, not the echo itself, and wave transmission refers to what passes into the new medium rather than the echoed portion.

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