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01---两列波在相遇处发生干涉的条件
2022-06-24 19:25:00 【勤奋的大熊猫】
问题描述
有两列频率相同的光波在空间相遇叠加后,若产生干涉,该两列波在相遇处不需要具备什么条件?
A. 振动方向相同
B. 相位差恒定
C. 振幅相差不太大
D. 传播方向相同
答案
上述问题应该选择D选项。
解析
A选项:首先光波分为横波和纵波,横波是振动方向于传播方向垂直的波,纵波是振动方向和传播方向一致的波。显然,横波与纵波之间是无法形成干涉的。因此A选项排除。B选项:两列波要想产生干涉条纹,必须有恒定的相位差。因此B选项排除。C选项:振幅如果相差太大,可以想象,其中一列波对最终的干涉条纹的贡献值相较于另一列波可以忽略,所以也不合理。因此C选项排除。D选项:传播方向可以不相同,比如驻波,就是由两列传播方向恰好相反的光波干涉形成的。因此我们应该选择D。
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