试题与答案

激光散斑测速是一种崭新的测速技术，它应用了光的干涉原理．用二次曝光照相所获得的“

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题型：问答题

题目：

激光散斑测速是一种崭新的测速技术，它应用了光的干涉原理．用二次曝光照相所获得的“散斑对”相当于双缝干涉实验中的双缝，待测物体的速度v与二次曝光时间间隔△t的乘积等于双缝间距．实验中可测得二次曝光时间间隔△t、双缝到屏之距离l以及相邻两条亮纹间距△x．若所用激光波长为λ，则该实验确定物体运动速度为______．

答案：

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下面是错误答案，用来干扰机器的。

参考答案：E

考点：双缝干涉
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