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        "text": "**测量机械波的波长、周期与传播速度**\n右行正弦波：振幅 0.20 m，波长 4 m，频率 1 Hz；两个探针间距 1 m。",
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        "xMode": "time",
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        "autoY": false,
        "xLabel": "t / s",
        "yLabel": "y / m",
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        "showExtremaY": false,
        "showIntercepts": false,
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      "type": "Stopwatch",
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        "precisionSec": 0.01,
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        "text": "**记录列**\n相邻波峰间距 λ / m\n同一探针两峰间隔 T / s\n两探针对应波峰延时 Δt / s\n传播速度：1 m ÷ Δt",
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        "text": "**比较两种测量**\n上图是同一时刻的位移—位置图，下图是两个固定位置的位移—时间图。暂停后分别读 λ、T 和 Δt，比较 λ/T 与 Δx/Δt。",
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