为了观察到纳米级的微小结构,需要用到分辨率比光学显微镜更高的

为了观察到纳米级的微小结构,需要用到分辨率比光学显微镜更高的电子显微镜。下列说法中正确的是

A.电子显微镜所利用电子物质波的波长可以比可见光短,因此不容易发生明显衍射

B.电子显微镜所利用电子物质波的波长可以比可见光长,因此不容易发生明显衍射

C.电子显微镜所利用电子物质波的波长可以比可见光短,因此更容易发生明显衍射

D.电子显微镜所利用电子物质波的波长可以比可见光长,因此更容易发生明显衍射

答案

A


解析:

为了观察纳米级的微小结构,用光学显微镜是不可能的。因为可见光的波长数量级是10-7m,远大于纳米,会发生明显的衍射现象,因此不能精确聚焦。如果用很高的电压使电子加速,使它具有很大的动量,其物质波的波长就会很短,衍射的影响就小多了。因此本题应选A。

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