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5. You are exploring in a cave and call out to one of your friends. You hear your echo. Which interaction of sound, (reflection, refraction or absorption), caused the echo and how did the sound waves move?
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5. You are exploring in a cave and call out to one of your friends. You hear your echo. Which interaction of sound, (reflection, refraction or absorption), caused the echo and how did the sound waves move? (5pts)

User Rik Heywood
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Refraction. Sound waves are bended when changed from one medium to another.
User Wei Shen
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