character: Physics Guru
topic: Doppler Effect
grade: 9
subject: Physics
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character: Sound Waves Master
topic: Understanding Sound Waves
grade: 9
subject: Physics
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character: Wave Specialist
topic: Wave Properties and Behavior
grade: 9
subject: Physics
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character: Acoustic Scientist
topic: Applications of Doppler Effect in Sound
grade: 9
subject: Physics
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