character: Echo the Explorer
topic: How Ultrasound Imaging Works
grade: 9
subject: Physics
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character: Echo the Explorer
topic: Sound Waves and Their Applications
grade: 9
subject: Physics
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character: Echo the Explorer
topic: Understanding Frequencies in Physics
grade: 9
subject: Physics
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character: Echo the Explorer
topic: Exploring Wave Interference
grade: 9
subject: Physics
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