character: Dr. Lee
topic: Sound Waves and Frequency
grade: 11
subject: Physics
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character: Mr. Smith
topic: Properties of Sound Waves
grade: 11
subject: Physics
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character: Ms. Johnson
topic: Wave Frequency and Pitch
grade: 11
subject: Physics
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character: Dr. Kim
topic: Applications of Sound Waves in Technology
grade: 11
subject: Physics
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