character: Mr. John Smith
topic: Introduction to Waves and Sound
grade: 9
subject: Physics
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character: Ms. Jane Doe
topic: Properties of Sound Waves
grade: 9
subject: Physics
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character: Dr. Emily Johnson
topic: Applications of Waves in Technology
grade: 9
subject: Physics
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character: Mr. Robert Brown
topic: Frequency and Amplitude in Sound
grade: 9
subject: Physics
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