character: Ms. Johnson
topic: Understanding Frequency and Sound Waves
grade: 9
subject: Physics
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character: Mr. Smith
topic: Wave Properties and Sound Transmission
grade: 9
subject: Physics
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character: Dr. Lee
topic: The Relationship Between Frequency and Pitch
grade: 9
subject: Physics
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character: Mrs. Davis
topic: Applications of Sound Waves in Technology
grade: 9
subject: Physics
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