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character: Echo
topic: How Sound Travels: Mediums, Speed, and Frequency Dependence
grade: 9
subject: Physics
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character: Sound Waves
topic: Properties of Sound: How Medium Affects Speed
grade: 9
subject: Physics
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character: Frequency
topic: The Role of Frequency in Sound Travel
grade: 9
subject: Physics
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character: Wave Behavior
topic: Understanding Reflection and Echo in Different Environments
grade: 9
subject: Physics
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