character: Ms. Sarah Johnson
topic: Frequency Modulation and Sound Technology
grade: 9
subject: Physics
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character: Ms. Emily Carter
topic: Wave Properties and Sound Waves
grade: 9
subject: Physics
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character: Mr. James Smith
topic: Introduction to Sound and Waves
grade: 9
subject: Physics
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character: Dr. Robert Brown
topic: Applications of Sound Technology in Communication
grade: 9
subject: Physics
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