character: Mr. Alex Johnson
topic: Effects of Medium on Sound Speed
grade: 12
subject: Physics
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character: Dr. Emily Smith
topic: Properties of Waves and Sound Transmission
grade: 12
subject: Physics
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character: Ms. Sarah Lee
topic: Influence of Temperature on Sound Velocity
grade: 12
subject: Physics
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character: Mr. Robert Brown
topic: Medium Types and Their Impact on Acoustics
grade: 12
subject: Physics
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