character: Dr. Emily Chen
topic: Sound Waves and Their Applications
grade: 9
subject: Physics
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character: Dr. Lisa Wang
topic: The Physics of Sound Waves
grade: 9
subject: Physics
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character: Professor John Smith
topic: Applications of Sound in Technology
grade: 9
subject: Physics
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character: Mr. Alex Johnson
topic: Understanding Frequency and Amplitude in Sound
grade: 9
subject: Physics
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