character: Professor Smith
topic: Understanding Frequency in Sound
grade: 11
subject: Physics
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character: Dr. Johnson
topic: Waves and Sound Propagation
grade: 11
subject: Physics
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character: Ms. Lee
topic: The Relationship Between Frequency and Pitch
grade: 11
subject: Physics
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character: Mr. Chen
topic: Sound Waves and Their Properties
grade: 11
subject: Physics
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