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How to Teach Physics to Your Dog

Orzel, Chad

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When physics professor Chad Orzel went to the pound to adopt a dog, he never imagined Emmy. She wasn't just a friendly mutt who needed a home; she was a talking dog with an active interest in what her new owner did for a living and how it could work for her.

Soon Emmy was trying to use the strange ideas of quantum mechanics for the really important things in her life: chasing critters, getting treats, and going for walks. She peppered Chad with questions: Could she use quantum tunneling to get through the neighbor's fence and chase bunnies? What about quantum teleportation to catch squirrels before they climb out of reach? Where are all the universes in which Chad drops steak on the floor? And what about the bunnies made of cheese that ought to be appearing out of nothing in the backyard?

With great humor and clarity, Chad Orzel explains to Emmy, and to human readers, just what quantum mechanics is and how it works -- and why, although you can't use it to catch squirrels or eat steak, it's still bizarre, amazing, and important to every dog and human.

Follow along as Chad and Emmy discuss the central elements of quantum theory, from particles that behave like waves and Heisenberg's uncertainty principle to entanglement ("spooky action at a distance") and virtual particles. Along the way, they discuss the history of the theory, such as the experiments that discovered that electrons are waves and particles at the same time, and Albert Einstein and Niels Bohr's decades-long debate over what quantum theory really meant (Einstein may have been smarter, but Bohr was right more often).

Don't get caught looking less informed than Emmy. "How to Teach Physics to Your Dog" will show you the universe that lies beneath everyday reality, in all its randomness, uncertainty, and wonder.

"Forget Schrodinger's Cat," says Emmy, "quantum physics is all about dogs." And once you see quantum physics explained to a dog, you'll never see the world the same way again.

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About the Author:

Chad Orzel was born and raised in central New York, and received a degree in physics from Williams College , and his Ph.D. in chemical physics from the University of Maryland. He is now a professor in the Department of Physics and Astronomy at Union College in Schenectady , New York . He lives near campus with his wife Kate, their daughter, and, of course, Emmy, the Queen of Niskayuna.

Excerpt. © Reprinted by permission. All rights reserved.:

INTRODUCTION
Why Talk to Your Dog about Physics?
An Introduction to Quantum Physics

The Mohawk-Hudson Humane Society has set up a little path through the woods near their facility outside Troy, so you can take a walk with a dog you’re thinking of adopting. There’s a bench on the side of the path in a small clearing, and I sit down to look at the dog I’ve taken out.

She sits down next to the bench, and pokes my hand with her nose, so I scratch behind her ears. My wife and I have looked at a bunch of dogs together, but Kate had to work, so I’ve been dispatched to pick out a dog by myself. This one seems like a good fit.

She’s a year-old mixed-breed dog, German shepherd and something else. She’s got the classic shepherd black and tan coloring, but she’s small for a shepherd, and has floppy ears. The tag on her kennel door gave her name as “Princess,” but that doesn’t seem appropriate.

“What do you think, girl?” I ask. “What should we call you?”

“Call me Emmy!” she says.

“Why’s that?”

“Because it’s my name, silly.”

Being called “silly” by a dog is a little surprising, but I guess she has a point. “Okay, I can’t argue with that. So, do you want to come live with us?”

“Well, that depends,” she says. “What’s the critter situation like?”

“Beg pardon?”

“I like to chase things. Will there be critters for me to chase?”

“Well, yeah. We’ve got a good-sized yard, and there are lots of birds and squirrels, and the occasional rabbit.”

“Ooooh! I like bunnies!” She wags her tail happily. “How about walks? Will I get walks?”

“Of course.”

“And treats? I like treats.”

“You’ll get treats if you’re a good dog.”

She looks faintly offended. “I am a very good dog. You will give me treats. What do you do for a living?”

“What? Who’s evaluating who, here?”

“I need to know if you deserve a dog as good as me.” The name “Princess” may have been more apt than I thought. “What do you do for a living?”

“Well, my wife, Kate, is a lawyer, and I’m a professor of physics at Union College, over in Schenectady. I teach and do research in atomic physics and quantum optics.”

“Quantum what?”

“Quantum optics. Broadly defined, it’s the study of the interaction between light and atoms in situations where you have to describe one or both of them using quantum physics.”

“That sounds complicated.”

“It is, but it’s fascinating stuff. Quantum physics has all sorts of weird and wonderful properties. Particles behave like waves, and waves behave like particles. Particle properties are indeterminate until you measure them. Empty space is full of ‘virtual particles’ popping in and out of existence. It’s really cool.”

“Hmmm.” She looks thoughtful, then says, “One last test.”

“What’s that?”

“Rub my belly.” She flops over on her back, and I reach down to rub her belly. After a minute of that, she stands up, shakes herself off, and says “Okay, you’re pretty good. Let’s go home.”

We head back to the kennel to fill out the adoption paperwork. As we’re walking, she says, “Quantum physics, huh? I’ll have to learn something about that.”

“Well, I’d be happy to explain it to you sometime.”

Like most dog owners, I spend a lot of time talking to my dog. Most of our conversations are fairly typical—don’t eat that, don’t climb on the furniture, let’s go for a walk. Some of our conversations, though, are about quantum physics.

Why do I talk to my dog about quantum physics? Well, it’s what I do for a living: I’m a college physics professor. As a result, I spend a lot of time thinking about quantum physics.

What is quantum physics? Quantum physics is one part of “modern physics,” meaning physics based on laws discovered after about 1900. Laws and principles of physics that were developed before about 1900 are considered “classical” physics.

Classical physics is the physics of everyday objects—tennis balls and squeaky toys, stoves and ice cubes, magnets and electrical wiring. Classical laws of motion govern the motion of anything large enough to see with the naked eye. Classical thermodynamics explains the physics of heating and cooling objects, and the operation of engines and refrigerators. Classical electromagnetism explains the behavior of lightbulbs, radios, and magnets.

Modern physics describes the stranger world that we see when we go beyond the everyday. This world was first revealed in experiments done in the late 1800s and early 1900s, which cannot be explained with classical laws of physics. New fields with different rules needed to be developed.

Modern physics is divided into two parts, each representing a radical departure from classical rules. One part, relativity, deals with objects that move very fast, or are in the presence of strong gravitational forces. Albert Einstein introduced relativity in 1905, and it’s a fascinating subject in its own right, but beyond the scope of this book.

The other part of modern physics is what I talk to my dog about. Quantum physics or quantum mechanics* is the name given to the part of modern physics dealing with light and things that are very small—molecules, single atoms, subatomic particles. Max Planck coined the word “quantum” in 1900, and Einstein won the Nobel Prize for presenting the first quantum theory of light.† The full theory of quantum mechanics was developed over the next thirty years or so.

The people who made the theory, from early pioneers like Planck and Niels Bohr, who made the first quantum model of the hydrogen atom, to later visionaries like Richard Feynman and Julian Schwinger, who each independently worked out what we now call “quantum electrodynamics” (QED), are rightly regarded as titans of physics. Some elements of quantum theory have even escaped the realm of physics and captured the popular imagination, like Werner Heisenberg’s uncertainty principle, Erwin SchrÖdinger’s cat paradox, and the parallel universes of Hugh Everett’s many-worlds interpretation.

Modern life would be impossible without quantum mechanics. Without an understanding of the quantum nature of the electron, it would be impossible to make the semiconductor chips that run our computers. Without an understanding of the quantum nature of light and atoms, it would be impossible to make the lasers we use to send messages over fiber-optic communication lines.

Quantum theory’s effect on science goes beyond the merely practical—it forces physicists to grapple with issues of philosophy. Quantum physics places limits on what we can know about the universe and the properties of objects in it. Quantum mechanics even changes our understanding of what it means to make a measurement. It requires a complete rethinking of the nature of reality at the most fundamental level.

Quantum mechanics describes an utterly bizarre world, where nothing is certain and objects don’t have definite properties until you measure them. It’s a world where distant objects are connected in strange ways, where there are entire universes with different histories right next to our own, and where “virtual particles” pop in and out of existence in otherwise empty space.

Quantum physics may sound like the stuff of fantasy fiction, but it’s science. The world described in quantum theory is our world, at a microscopic scale.* The strange effects predicted by quantum physics are real, with real consequences and applications. Quantum theory has been tested to an incredible level of precision, making it the most accurately tested theory in the history of scientific theories. Even its strangest predictions have been verified experimentally (as we’ll see in chapters 7, 8, and 9).

So, quantum physics is neat stuff. But what does it have to do with dogs?

Dogs come to quantum physics in a better position than most humans. They approach the world with fewer preconceptions than humans, and always expect the unexpected. A dog can walk down the same street every day for a year, and it will be a new experience every day. Every rock, every bush, every tree will be sniffed as if it had never been sniffed before.

If dog treats appeared out of empty space in the middle of a kitchen, a human would freak out, but a dog would take it in stride. Indeed, for most dogs, the spontaneous generation of treats would be vindication—they always expect treats to appear at any moment, for no obvious reason.

Quantum mechanics seems baffling and troubling to humans because it confounds our commonsense expectations about how the world works. Dogs are a much more receptive audience. The everyday world is a strange and marvelous place to a dog, and the predictions of quantum theory are no stranger or more marvelous than, say, the operation of a doorknob.*

Discussing quantum physics with my dog is useful because it helps me see how to discuss quantum mechanics with humans. Part of learning quantum mechanics is learning to think like a dog. If you can look at the world the way a dog does, as an endless source of surprise and wonder, then quantum mechanics will seem a lot more approachable.

This book reproduces a series of conversations with my dog about quantum physics. Each conversation is followed by a detailed discussion of the physics involved, aimed at interested human readers. The topics range from ideas many people have heard of, like particle-wave duality (chapter 1) and the uncertainty pr...

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