Question

Sat2 物理题

At the third maxima on both sides of the zeroth fringe in a Young's double slit experiment , the light () A. travels the same time B. from the lower opening travels three times farther than the light from the upper opening. C.from the upper opening travels three times farther than light from the lower opening.D. from either opening travels 2 wavelengths farther than light from the other opening.E.from either opening travels 3 wavelengths farther than light from the other opening.

Answer 1

你好歹给咱翻译一下再上啊。选E啊，说杨氏双缝干涉实验中，第三条亮纹中，光（）。
中央明纹到双缝的路程相等，两侧开始是第一条亮纹。第几条亮纹，光程差就是几个波长。
A说是光走了相同时间，B说一条光是一条光的三倍远
第n条纹实际上是分列两侧，对称分布的，因此不分上下，CD不对
E说，光程差是三个波长，对。