character: Mr. Johnson
topic: Properties of Sound
grade: 9
subject: Physics
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character: Ms. Smith
topic: Sound Waves and Their Behavior
grade: 9
subject: Physics
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character: Dr. Lee
topic: Frequency and Pitch in Sound
grade: 9
subject: Physics
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character: Mr. Chen
topic: Speed of Sound in Different Media
grade: 9
subject: Physics
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