character: Dr. Smith
topic: Understanding the Doppler Effect in Sound Waves
grade: 9
subject: Physics
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character: Professor Johnson
topic: Exploring Wave Frequency and Velocity
grade: 9
subject: Physics
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character: Ms. Thompson
topic: Applications of the Doppler Effect in Astronomy
grade: 9
subject: Physics
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character: Mr. Lee
topic: Comparing Light Waves and Sound Waves
grade: 9
subject: Physics
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