character: Ms. Lyra
topic: Sound Waves and Their Properties
grade: 9
subject: Physics
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character: Mr. Johnson
topic: The Speed of Sound in Different Mediums
grade: 9
subject: Physics
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character: Dr. Smith
topic: Amplitude and Frequency of Sound Waves
grade: 9
subject: Physics
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character: Ms. Garcia
topic: Doppler Effect and Its Applications
grade: 9
subject: Physics
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