character: Mr. Lee
topic: Frequency and Amplitude
grade: 9
subject: Physics
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character: Mr. Lee
topic: Waves and Their Properties
grade: 9
subject: Physics
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character: Mr. Lee
topic: Sound Waves and Their Characteristics
grade: 9
subject: Physics
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character: Mr. Lee
topic: Energy in Mechanical Waves
grade: 9
subject: Physics
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