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Einstein's Relativity and the Quantum Revolution: Modern Physics for Non-Scientists, 2nd Edition

Einstein's Relativity and the Quantum Revolution: Modern Physics for Non-Scientists, 2nd Edition

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Einstein's Relativity and the Quantum Revolution: Modern Physics for Non-Scientists, 2nd Edition

Course No. 153
Professor Richard Wolfson, Ph.D.
Middlebury College
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Course Overview

"It doesn't take an Einstein to understand modern physics," says Professor Richard Wolfson at the outset of this course on what may be the most important subject in the universe.

Relativity and quantum physics touch the very basis of physical reality, altering our commonsense notions of space and time, cause and effect. Both have reputations for complexity. But the basic ideas behind relativity and quantum physics are, in fact, simple and comprehensible by anyone. As Professor Wolfson points out, the essence of relativity can be summed up in a single sentence: The laws of physics are the same for all observers in uniform motion.

The same goes for quantum theory, which is based on the principle that the "stuff " of the universe—matter and energy—is not infinitely divisible but comes in discrete chunks called "quanta."

Profound ... Beautiful ... Relevant

Why should you care about these landmark theories? Because relativity and quantum physics are not only profound and beautiful ideas in their own right, they are also the gateway to understanding many of the latest science stories in the media. These are the stories about time travel, string theory, black holes, space telescopes, particle accelerators, and other cutting-edge developments.

Consider these ideas:

  • Although Einstein's theory of general relativity dates from 1914, it has not been possible to test certain predictions until recently. The Hubble Space Telescope is providing some of the most striking confirmations of the theory, including certain evidence for the existence of black holes, objects that warp space and time so that not even light can escape. Also, the expansion of the universe predicted by the theory of general relativity is now a known rate.
  • General relativity also predicts an even weirder phenomenon called "wormholes" that offer shortcuts to remote reaches of time and space.
  • According to Einstein's theory of special relativity, two twins would age at different rates if one left on a high-speed journey to a distant star and then returned. This experiment has actually been done, not with twins, but with an atomic clock flown around the world. Another fascinating experiment confirming that time slows as speed increases comes from measuring muons at the top and bottom of mountains.
  • A seemingly absurd consequence of quantum mechanics, called "quantum tunneling," makes it possible for objects to materialize through impenetrable barriers. Quantum tunneling happens all the time on the subatomic scale and plays an important role in electronic devices and the nuclear processes that keep the sun shining.
  • Some predictions about the expansion of the universe were so odd that Einstein himself tried to rewrite the mathematics in order to eliminate them. When Hubble discovered the expansion of the universe, Einstein called the revisions the biggest mistake he had ever made.
  • An intriguing thought experiment called "Schrödinger's cat" suggests that a cat in an enclosed box is simultaneously alive and dead under experimental conditions involving quantum phenomena.

From Aristotle to the Theory of Everything

Professor Wolfson begins with a brief overview of theories of physical reality starting with Aristotle and culminating in Newtonian or "classical" physics. Then he outlines the logic that led to Einstein's theory of special relativity, and the simple yet far-reaching insight on which it rests.

With that insight in mind, you move on to consider Einstein's theory of general relativity and its interpretation of gravitation in terms of the curvature of space and time.

Professor Wolfson then shows how inquiry into matter at the atomic and subatomic scales led to quandaries that are resolved—or at least clarified—by quantum mechanics, a vision of physical reality so at odds with our experience that it nearly defies language.

Bringing relativity and quantum mechanics into the same picture leads to hypotheses about the origin, development, and possible futures of the entire universe, and the possibility that physics can produce a "theory of everything" to account for all aspects of the physical world.

Fascinating Incidents and Ideas

Along the way, you'll explore these fascinating incidents and ideas:

  • In the 1880s, Albert Michelson and Edward Morley conducted an experiment to determine the motion of the Earth relative to the ether, which was a supposedly imponderable substance pervading all of space. You'll learn about their experiment, its shocking result, and the resulting theoretical crisis.
  • In 1905, a young Swiss patent clerk named Albert Einstein resolved the crisis by discarding the ether concept and asserting the principle of relativity—that the laws of physics are the same for all observers in uniform motion.
  • Relativity implies that the time order of events can be different in different reference frames. Does this wreak havoc with cause and effect? And why does Einstein assert that nothing can go faster than light?
  • Shortly after publishing his 1905 paper on special relativity, Einstein realized that his theory required a fundamental equivalence between mass and energy, which he expressed in the equation E=mc2. Among other things, this famous formula means that the energy contained in a single raisin could power a large city for a whole day.
  • Historically, the path to general relativity followed Einstein's attempt to incorporate gravity into relativity theory, which led to his understanding of gravity not as a force, but as a local manifestation of geometry in curved spacetime.
  • Quantum theory places severe limits on our ability to observe nature at the atomic scale because it implies that the act of observation necessarily disturbs the thing that is being observed. The result is Werner Heisenberg's famous "uncertainty principle."
  • Are quarks, the particles that make up protons and neutrons, the truly elementary particles? What are the three fundamental forces that physicists identify as holding particles together? Could they be manifestations of a single, universal force?

A Teaching Legend

On his own Middlebury College campus, Professor Wolfson is a teaching legend with an infectious enthusiasm for his subject and a knack for conveying difficult concepts in a way that fosters true understanding. He is the author of an introductory text on physics, a contributor to the esteemed publication Scientific American, and a specialist in interpreting science for the nonspecialist.

In this course, Professor Wolfson uses extensive illustrations and diagrams to help bring to life the theories and concepts that he discusses. Thus we highly recommend our DVD version, although Professor Wolfson is mindful of our audio students and carefully describes visual materials throughout his lectures.

Professor Richard Wolfson on the Second Edition of Einstein's Relativity:

"The first version of this course was produced in 1995. In this new version, I have chosen to spend more time on the philosophical interpretation of quantum physics, and on recent experiments relevant to that interpretation. I have also added a final lecture on the theory of everything and its possible implementation through string theory. The graphic presentations for the DVD version have also been extensively revised and enhanced. But the goal remains the same: to present the key ideas of modern physics in a way that makes them clear to the interested layperson."

Hide Full Description
24 lectures
 |  30 minutes each
Year Released: 2000
  • 1
    Time Travel, Tunneling, Tennis, and Tea
    What are the two big ideas of modern physics? How can nonscientists gain a handle on these ideas and the radical changes they bring to our philosophical thinking about the physical world? x
  • 2
    Heaven and Earth, Place and Motion
    Understanding motion is the key to understanding space and time. Is there a "natural" state of motion? Learn why the ancients gave different answers to this question, and how Copernicus, Kepler, and Galileo laid the foundation for a new approach. x
  • 3
    The Clockwork Universe
    Isaac Newton was born in 1642, the year that Galileo died. You'll learn how he built on the work of Galileo and Kepler, developing the three laws of motion and the concept of universal gravitation. You'll learn why Newton's laws suggest a universe that runs like a clock. x
  • 4
    Let There Be Light!
    The study of motion is not all there is to physics. By the 18th century, scientists were delving into the relationship between the two phenomena. Today, electromagnetism is known to be responsible for the chemical interactions of atoms and molecules and all of modern electronic technology. x
  • 5
    Speed c Relative to What?
    In mechanics (the branch of physics that studies motion), the principle of Galilean relativity holds—meaning that the laws of mechanics are the same for anything in uniform motion. Is the same true for the laws of electromagnetism? x
  • 6
    Earth and the Ether—A Crisis in Physics
    In the 1880s, Albert Michelson and Edward Morley conducted an experiment to determine the motion of Earth relative to the ether. You'll learn about their experiment, its shocking result, and the resulting theoretical crisis. x
  • 7
    Einstein to the Rescue
    In 1905 a young Swiss patent clerk named Albert Einstein resolved the crisis that flowed from the Michelson-Morley result. When Einstein discarded the ether concept and asserted that the principle of relativity holds for all of physics, mechanics as well as electromagnetism, he was making a simple claim with almost unimaginably profound implications. x
  • 8
    Uncommon Sense—Stretching Time
    Why does the simple statement of relativity—that the laws of physics are the same for all observers in uniform motion—lead directly to absurd-seeming situations that violate our commonsense notions of space and time? x
  • 9
    Muons and Time-Traveling Twins
    As a dramatic example of what relativity implies, you will consider a thought experiment involving a pair of twins, one of whom goes on a journey to the stars and returns to Earth younger than her sister! x
  • 10
    Escaping Contradiction—Simultaneity Is Relative
    If, as relativity implies, "moving clocks run slow," who's to say which clock is moving? x
  • 11
    Faster than Light? Past, Future, and Elsewhere
    Relativity implies that the time order of events can be different in different reference frames. Does this wreak havoc with cause and effect? Finally, why is it that nothing can go faster than light? x
  • 12
    What about E=mc² and Is Everything Relative?
    Shortly after publishing his 1905 paper on special relativity, Einstein realized that his theory required a fundamental equivalence between mass and energy, which he expressed in the equation E=mc2. Among other things, this famous formula means that the energy contained in a single raisin could power a large city for an entire day. x
  • 13
    A Problem of Gravity
    Historically, the path to general relativity followed Einstein's attempt to incorporate gravity into relativity theory, which led to his understanding of gravity not as a force, but as a local manifestation of geometry in curved spacetime. x
  • 14
    Curved Spacetime
    What causes spacetime to curve? Einstein's theory of relativity offers an answer, but for decades after he published it, there were only a few, very subtle tests of its validity. How has modern astrophysics changed all that? x
  • 15
    Black Holes
    General relativity is similar to Newtonian gravitation except in the case of very dense objects such as collapsed stars. Learn why they are called black holes. x
  • 16
    Into the Heart of Matter
    With this lecture, you turn from relativity to explore the universe at the smallest scales. By the early 1900s, Ernest Rutherford and colleagues showed that atoms consist of a positively charged nucleus surrounded by negatively charged electrons whirling around it. But Rutherford's model could not explain all the observed phenomena. x
  • 17
    Enter the Quantum
    The "stuff" of the universe—matter and energy—is not continuously subdividable but comes in discrete "chunks." This fundamental graininess of the universe has profound implications for the behavior of matter and energy at the smallest scales. x
  • 18
    Wave or Particle?
    Einstein's resolution of the photoelectric effect problem suggests that light consists of particles (photons). But how can this be reconciled with the understanding of light as an electromagnetic wave? x
  • 19
    Quantum Uncertainty—Farewell to Determinism
    Quantization places severe limits on our ability to observe nature at the atomic scale because it implies that the act of observation disturbs that which is being observed. The result is Werner Heisenberg's famous Uncertainty Principle. What exactly does this principle say, and what are the philosophical implications? x
  • 20
    Particle or Wave?
    In 1923, Louis de Broglie proposed that, like light photons, particles of matter might also display wave properties. The wave nature of smaller particles such as electrons is quite visible and leads to many unusual phenomena, including quantum tunneling mentioned in Lecture 1. x
  • 21
    Quantum Weirdness and Schrödinger's Cat
    Wave-particle duality gives rise to strange phenomena, some of which are explored in Schrödinger's famous "cat in the box" example. Philosophical debate on Schrödinger's cat still rages. x
  • 22
    The Particle Zoo
    Are quarks, the particles that make up protons and neutrons, the truly elementary particles? What are the three fundamental forces that physicists identify as holding particles together? Are they manifestations of a single, universal force? x
  • 23
    Cosmic Connections
    Why does physicist Freeman Dyson think that intelligence may persist into the infinite future, even as the universe evolves through an unimaginable richness of new forms and structures? x
  • 24
    Toward a Theory of Everything
    Why can't we answer questions about what happened before the Big Bang, or what goes on at the center of a black hole? Can we manage the formidable task of combining quantum physics with general relativity? Physics may well be the most important subject in the universe, a theoretical realm that ranges from the infinitesimally small to the infinitely vast, its laws governing time, space, and the forces that created our world. x

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Your professor

Richard Wolfson

About Your Professor

Richard Wolfson, Ph.D.
Middlebury College
Dr. Richard Wolfson is the Benjamin F. Wissler Professor of Physics at Middlebury College, where he also teaches Climate Change in Middlebury's Environmental Studies Program. He completed his undergraduate work at MIT and Swarthmore College, graduating from Swarthmore with a double major in Physics and Philosophy. He holds a master's degree in Environmental Studies from the University of Michigan and a Ph.D. in Physics from...
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Reviews

Rated 4.5 out of 5 by 139 reviewers.
Rated 5 out of 5 by Physics for the non expert Dr Wolfson is a very engaging lecturer, he clearly has a deep understanding of his subject and a love of teaching it. I liked his presentation style and learned a lot. Especially enjoyed the explanation of black holes. Would recommend. February 6, 2016
Rated 5 out of 5 by Most astonishing science purchase ever Excellent job by Dr. Wolfson to clearly put together in an intelligible way the very difficult picture of our universe from the subatomic world to distant galaxies. January 31, 2016
Rated 5 out of 5 by Einstein's Relativity - Excellent Instruction Although this lecture series was apparently initially produced about 15 years ago, it appears brand new and continues as an excellent course for someone wishing to achieve a non-mathematical understanding of Einstein's theories of relativity. Dr. Wolfson is clearly an expert. He is likable and his oral presentation is impressive, never boring. He knows his material so well, that his presentation sometimes goes so rapidly that it is can be a little difficult to digest on the first run through - he is, however, the only professor I have observed in a Teaching Company / Great Courses lecture who affirmatively encourages the listener to return to and review prior lectures to allow a full understanding of a concept. That said, he does an amazing job of bundling Einstein's various theories and musings (which were not all neatly chronological) together into a progressive and logically sequential explanation. Prompted by Dr. Wolfson's lectures, I went exploring in the library and discovered that he has managed to include and explain on a base level, in understandable context, some of Einstein's more convoluted and complex analyses (e.g., "Ether and Relativity" and "Geometry and Experience" discussed in his "Sidelights and Relativity" lectures of the 1920s). If I have a criticism - and it is more of a caution - it is that while the course does not demand any high level mathematical knowledge, I personally feel that a listener should probably have some prior understanding of classic physics to be able to successfully follow Dr. Wolfson's lectures to their true intellectual value. I would guess that most of those who would purchase a Great Courses lecture series would fall into that category. Excellent instruction, an excellent product, and, excellent value. January 28, 2016
Rated 1 out of 5 by Hopelessly out of date All throughout this course you will hear references to scientific experiments in progress that have in reality been completed years ago. This audio presentation was done back in the year 2000. This program is so badly in need of an update that it is almost funny. The professor is interesting, his lectures are very well done, and the subject matter can be quite fascinating. Perhaps this is part of the reason why it is so sad that an updated version of the course has not been released. Listening is not a complete waste of time, but the value of listening to this course would increase tremendously if it were updated. If you want to learn about the cutting edge, this course is not for you. November 8, 2015
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