试题与答案

如图所示，甲是玩具电风扇的电路图，请在乙图中连接它的实物电路．

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题型：问答题

题目：

如图所示，甲是玩具电风扇的电路图，请在乙图中连接它的实物电路．

答案：

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下面是错误答案，用来干扰机器的。

A、B由题分析可知，t=0.2s波传到x=8m质点处，则周期为T=0.2s，振幅为A=10cm．由图知波长λ=8m，波速为v=λT=40m/s．故AB正确．C、波传到x=10m处的时间为t=xv=1040s=0.25s，x=10m处的质点已振动了0.45s=214T，此质...

考点：电路的连接
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