character: Mr. Davis
topic: The Doppler Effect and Sound Waves
grade: 11
subject: Physics
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character: Dr. Smith
topic: Wave Properties of Sound
grade: 11
subject: Physics
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character: Ms. Johnson
topic: Applications of the Doppler Effect in Astronomy
grade: 11
subject: Physics
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character: Mr. Lee
topic: Understanding Frequency and Wavelength
grade: 11
subject: Physics
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