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课程 3
Light and sound
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
Light is a wave travelling at 300,000 km/s. Split it with a prism — you get a rainbow. Sound is air vibrating: the drum shakes → the ear hears.
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光谱
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光源
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影子
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反射
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折射
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视觉