character: Echo Explorer
topic: Reflection and Refraction of Sound
grade: 9
subject: Physics
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character: Sound Waves
topic: Properties of Sound and Its Behavior
grade: 9
subject: Physics
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character: Acoustic Engineer
topic: Engineering Applications of Sound Reflection
grade: 9
subject: Physics
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character: Physicist
topic: Fundamentals of Sound Waves and Their Interaction with Media
grade: 9
subject: Physics
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