character: Mr. Johnson
topic: Properties of Sound Waves
grade: 11
subject: Physics
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character: Dr. Smith
topic: Wave Behavior and Sound Applications
grade: 11
subject: Physics
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character: Ms. Lee
topic: Understanding Frequency and Amplitude
grade: 11
subject: Physics
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character: Mr. Brown
topic: Sound Wave Interference and Doppler Effect
grade: 11
subject: Physics
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