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Gaokao Physics Practice Question

渔船常用回声探测器发射的声波探测水下鱼群与障碍物。声波在水中传播速度为 $1500\ \mathrm{m/s}$ ,若探测器发出频率为 $1.5 \times 10^6\ \mathrm{Hz}$ 的声波,下列说法正确的是

  1. A.两列声波相遇时一定会发生干涉
  2. B.声波由水中传播到空气中,波长会改变
  3. C.该声波遇到尺寸约为1m的被探测物时会发生明显衍射
  4. D.探测器接收到的回声频率与被探测物相对探测器运动的速度无关

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