一导言从1900年起到现在的五十年中物理学的发展之大,在整个物理学发展的历史上是很突出的。二十世纪的物理不仅在内容的丰富上比以往大大的增加了,而且在物理学基本概念上发生了革命性的改变。这五十年来物理学的进展是如此之大,使我无法在短短的一两个钟头之内作一个详细的介绍。我只能举出一些我认为比较重要的发展说一说,而且也只能说一个大概的名目,至于发展的内容,除了其中主要的概念能够略略提一提以外,就不可能再多说什麽了。我所挑选出来讲的固然是物理学中 I. INTRODUCTION The great development of physics from 1900 to the present 50 years is prominent in the entire history of physics. The twentieth-century physics has not only greatly increased its content richness than ever before, but has undergone revolutionary changes in the basic concepts of physics. The progress of physics in these fifty years has been so great that I can not give a detailed introduction in just one or two hours. I can only cite some developments which I think are more important to talk about, and I can only say one general heading. As for the content of development, it is impossible to say anything but the main concepts of which can be briefly mentioned It’s I chose to speak of course is in physics