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CRC Press eBooks

Modern Physics Concepts

J. Kenneth Shultis, Richard E. Faw

Published Sep 7, 2007• 0 citations
Publisher

Abstract

During the first three decades of the twentieth century, our understanding of the physical universe underwent tremendous changes. The classical physics of Newton and the other scientists of the eighteenth and nineteenth centuries was shown to be inadequate to describe completely our universe. The results of this revolution in physics are now called “modern” physics, although they are now almost a century old.

DOI
10.1201/b12824-6

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Abstract This chapter introduces the book by emphasizing how our perception of the universe is quite different from the actual laws that govern this universe. An attempt to understand the laws that govern our universe goes back to antiquity. The modern scientific revolution took place in the seventeenth century. All the phenomena that we observe in nature seem to follow the laws that were discovered by Newton, Maxwell, and others. Our intuition is based on these laws. The most remarkable developments that took place at the beginning of the twentieth century included Einstein’s theory of relativity and quantum mechanics. These laws, which are presented in this book, are highly counterintuitive and mysterious.

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During the first three decades of the twentieth century, our understanding of the physical universe underwent tremendous changes. The classical physics of Newton and the other scientists of the eighteenth and nineteenth centuries was shown to be inadequate to describe completely our universe. The results of this revolution in physics are now called “modern” physics, although they are now almost a century old.
The twentieth century has seen two major revolutions in our theories of physics concerning nature, and these have made us change many of our concepts about the terms in which nature can be described. The new theories born in these revolutions are the theory of relativity and of quantum mechanics. The biological sciences had their revolutions in the nineteenth century, and while remarkable progress has been made since, nothing comparable to that upheaval has occurred in this century. Of the two massive changes in the concepts of the physical sciences, we can discuss but one here. [excerpt]
The first decades of the twentieth century were marked by two revolutionary scientific accomplishments, the theory of relativity and quantum mechanics, with repercussions still felt today. Relativity theory and quantum mechanics became the two most important branches of “Modern Physics” that emerged as an alternative to “Classical Physics” (a term often used interchangeably with that of “Newtonian” or “Galilean” physics). No field of science (from astronomy to the life sciences), no field of knowledge (from philosophy to sociology), and no artistic practice (from architecture to the fine arts) was left untouched by these investigations into the nature of our physical universe.
Modern physical science has moved a considerable distance from the deterministic materialism of the nineteenth century. Even then, the inclusion of fields (gravitational, magnetic, and electric) complemented the massy, solid atoms in making up the world-picture of physics. But in the twentieth century, science replaced the earlier ontology entirely. Quantum mechanics, the crowning achievement of modern physics, has re-opened ages-old questions about the nature of reality, causation, and the connection between consciousness and the external world. The fundamental ground of modern physics is at the epistemological level — what we can know about physical systems is basic, rather than an onto-logical account of the world as it ‘really is.’ These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Abstract This chapter introduces the book by emphasizing how our perception of the universe is quite different from the actual laws that govern this universe. An attempt to understand the laws that govern our universe goes back to antiquity. The modern scientific revolution took place in the seventeenth century. All the phenomena that we observe in nature seem to follow the laws that were discovered by Newton, Maxwell, and others. Our intuition is based on these laws. The most remarkable developments that took place at the beginning of the twentieth century included Einstein’s theory of relativity and quantum mechanics. These laws, which are presented in this book, are highly counterintuitive and mysterious.