character: Mr. Thompson
topic: Transmission of Sound Waves
grade: 11
subject: Physics
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character: Ms. Johnson
topic: Wave Speed in Different Mediums
grade: 11
subject: Physics
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character: Dr. Roberts
topic: Characteristics of Sound Waves
grade: 11
subject: Physics
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character: Professor Lee
topic: Mediums Affecting Sound Propagation
grade: 11
subject: Physics
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