A SIMPLE GUIDE TO POPULAR PHYSICS: AN INTRODUCTION TO PARTICLES, QUANTUM PHYSICSAND COSMOLOGY FOR ABSOLUTE BEGINNERS
By TONY HARRIS
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About this ebook
Harris's inviting guide promises to give "absolute beginners" from "teens to centenarians" a basic grounding in particle physics, quantum physics, and cosmology-all without making readers do math. With the goal of introducing the basics and encouraging read
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A SIMPLE GUIDE TO POPULAR PHYSICS - TONY HARRIS
Introduction
This book offers the casual reader an insight into the physics of nature. It is by no means a comprehensive study; rather, it assumes that the reader has little or no previous knowledge of the subject. Anyone from teens to centenarians can derive a basic grounding in particle physics, quantum physics and cosmology from this book. And the really good news is that there are no mathematics or mathematical equations involved, apart from one that I’m sure you’ve all heard before:
E = mc²
On a minute scale, we have particle physics and quantum mechanics, and on a huge scale, we have the cosmos. None of these subjects can be considered easy
, but my aim is to offer you as simple an understanding as possible. That is why I will explain every theory and concept I cover in this book concisely to give you a starting point. A basic understanding of these concepts and theories will lead you to a better understanding of the more detailed popular science books. After all, it is good advice to learn to walk before you run.
Chapter 1 – The Professor’s Diamond
Figure 1 – The Professor’s Diamond¹
In 2011, the British Broadcasting Corporation (BBC) broadcast a lecture called A Night with the Stars, presented by Professor Brian Cox. The studio audience was made up of well–known British celebrities and there were millions of viewers.
The subject was quantum mechanics.
The entertaining and informative broadcast was on the whole well received, but there were some viewers who took exception to an assertion by Professor Cox towards the end of his lecture. A few of these were physicists themselves.
Professor Cox had a prop to help with his explanation of Pauli’s exclusion principle, which says:
No two electrons can be in the same quantum state in atoms.
We will explore Pauli’s Principle in more detail later in the book. Suffice to say now that Professor Cox gave a good summary of the exclusion principle, and then produced a large diamond. He rubbed the diamond between his hands and informed the audience that this action had altered the energy levels of not only the three million, million, billion electrons in the diamond, but all the electrons in the universe.
I admit that I was rather surprised and more than a little sceptical at this statement. As a result, I spent a considerable amount of time researching the professor’s statement and revising my previous reading. By the end of my research, I realised I had increased my knowledge substantially by questioning Professor Cox’s simple assertion.
In making this statement in his popular lecture, broadcast on prime-time television, Professor Cox had shown that in quantum physics, everything is connected. His critics had missed the point; the professor knew his audience. If he had gone into detail about the exclusion principle and the complicated concepts and mathematics involved, he would have lost their attention.
He was also limited by the airtime of the programme. To explain that no two electrons can be in the same quantum state in a few minutes is impossible. Instead, he used just one parameter of the four required to describe an electron’s quantum state: energy levels. Energy levels in Pauli’s exclusion principle are relatively easy to explain. In doing so, Professor Cox simplified the concept and put his point across to people without a PhD in Physics.
Brian Cox is not only a reputable physicist; as far as laypeople who take an interest in popular science are concerned, he is a brilliant communicator. Those of us who are