character: Physics Guru
topic: Applications of the Doppler Effect
grade: 9
subject: Physics
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character: Wave Expert
topic: Sound Waves and the Doppler Effect
grade: 9
subject: Physics
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character: Astrophysics Ace
topic: Redshift and Blueshift in Astronomy
grade: 9
subject: Physics
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character: Motion Master
topic: Doppler Effect in Everyday Life
grade: 9
subject: Physics
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