试题与答案

下列说法正确的是 [ ] A.图①为两列频率相同,振幅相同的相干水波于某时刻叠加

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题目:

下列说法正确的是

[ ]

A.图①为两列频率相同,振幅相同的相干水波于某时刻叠加,实线和虚线分别表示波峰和波谷,则此时c点正处于平衡位置且向下运动

B.图②S为在水面上振动的波源,M、N为在水面上的两块挡板,要使A处水也能发生振动,则波源S的频率应该变小

C. 图③是个单摆做受迫振动,其共振曲线(振幅A与驱动力的频率f的关系)图,由此判断出该单摆摆长约为1m

D. 图④是竖直肥皂膜的横截面,用单色光照射薄膜,在薄膜上产生明暗相间的竖直条纹

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