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character: Mr. Echo
topic: Sound Waves and Their Properties
grade: 9
subject: Physics
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character: Sound Wave
topic: Characteristics of Sound
grade: 9
subject: Physics
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character: Mr. Echo's Friend
topic: Sound Reflection and Absorption
grade: 9
subject: Physics
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character: Acoustic Engineer
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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