character: Mr. Chen
topic: Sound Waves and Their Properties
grade: 11
subject: Physics
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character: Mr. Chen
topic: Wave Interference and Resonance
grade: 11
subject: Physics
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character: Mr. Chen
topic: Applications of Sound Waves in Technology
grade: 11
subject: Physics
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character: Mr. Chen
topic: The Doppler Effect and Sound Waves
grade: 11
subject: Physics
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