A-A+
Why was Townes' early work with stimulated emi
问题详情
Why was Townes" early work with stimulated emission done with microwaves？
A．He was not concerned with light amplification.
B．It was easier to work with longer wavelengths.
C．His partner Schawlow had already begun to work on laser.
D．The laser had already been developed.
参考答案
正确答案：B
解析：推理判断题。文章第三段讲到了Townes用较长的微波来研究激光而不是昔通光，但是他成功后，好多人(包括他自己)都在用波长更短的光线来研究激光，直到1957年，理论才明朗起来，这就暗示了B“用较长的微波来研究要容易一些”这一项的意思。A为“他对于增强光线不感兴趣”；C为“他的搭档Schawlow 已开始研究激光了”，文中没有提到：D为“激光早已研制出来了”，从文中可知，那时激光还未研制出来，所以D也不符合题意。
