character: Wave Properties
topic: Understanding Sound Waves
grade: 9
subject: Physics
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character: Wave Behavior
topic: Reflection and Refraction of Sound
grade: 9
subject: Physics
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character: Sound Intensity
topic: The Relationship between Amplitude and Loudness
grade: 9
subject: Physics
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character: Doppler Effect
topic: How Motion Affects Sound Waves
grade: 9
subject: Physics
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