An introduction to quantum theory and its concept

In other words, individual photons can deliver more or less energy, but only depending on their frequencies. In nature, single photons are rarely encountered.

An introduction to quantum theory and its concept

Ivy Wigmore Share this item with your network: Quantum theory is the theoretical basis of modern physics that explains the nature and behavior of matter and energy on the atomic and subatomic level.

The nature and behavior of matter and energy at that level is sometimes referred to as quantum physics and quantum mechanics. Planck had sought to discover the reason that radiation from a glowing body changes in color from red, to orange, and, finally, to blue as its temperature rises.

He found that by making the assumption that energy existed in individual units in the same way that matter does, rather than just as a constant electromagnetic wave - as had been formerly assumed - and was therefore quantifiable, he could find the answer to his question.

The existence of these units became the first assumption of quantum theory. Planck wrote a mathematical equation involving a figure to represent these individual units of energy, which he called quanta.

The equation explained the phenomenon very well; Planck found that at certain discrete temperature levels exact multiples of a basic minimum valueenergy from a glowing body will occupy different areas of the color spectrum.

Planck assumed there was a theory yet to emerge from the discovery of quanta, but, in fact, their very existence implied a completely new and fundamental understanding of the laws of nature.

Planck won the Nobel Prize in Physics for his theory inbut developments by various scientists over a thirty-year period all contributed to the modern understanding of quantum theory. The Development of Quantum Theory InPlanck made the assumption that energy was made of individual units, or quanta.

InAlbert Einstein theorized that not just the energy, but the radiation itself was quantized in the same manner. InLouis de Broglie proposed that there is no fundamental difference in the makeup and behavior of energy and matter; on the atomic and subatomic level either may behave as if made of either particles or waves.

This theory became known as the principle of wave-particle duality: InWerner Heisenberg proposed that precise, simultaneous measurement of two complementary values - such as the position and momentum of a subatomic particle - is impossible. Contrary to the principles of classical physics, their simultaneous measurement is inescapably flawed; the more precisely one value is measured, the more flawed will be the measurement of the other value.

Niels Bohr proposed the Copenhagen interpretation of quantum theory, which asserts that a particle is whatever it is measured to be for example, a wave or a particlebut that it cannot be assumed to have specific properties, or even to exist, until it is measured.

In short, Bohr was saying that objective reality does not exist. First, we have a living cat and place it in a thick lead box.

At this stage, there is no question that the cat is alive. We then throw in a vial of cyanide and seal the box. We do not know if the cat is alive or if the cyanide capsule has broken and the cat has died.


Since we do not know, the cat is both dead and alive, according to quantum law - in a superposition of states.

It is only when we break open the box and see what condition the cat is that the superposition is lost, and the cat must be either alive or dead.Introduction: Quantum World.

and no other theory can match its description of how Danish physicist Niels Bohr explained this wave-particle duality by doing away with the concept of a.

want to be proficient with the theory, an honest, “no-nonsense” book like Peres’s is the perfect place to start; for in so many places it supplants many a standard quantum theory text. R. Clifton, Foundations of Physics (Jan. ) This book provides a good introduction to many important topics in the foundations of quantum mechanics.

Quantum mechanics is the science of the very small. It explains the behavior of matter and its interactions with energy on the scale of atoms and subatomic contrast, classical physics only explains matter and energy on a scale familiar to human experience, including the behavior of astronomical bodies such as the Moon.

Classical physics is still used in much of modern science and.

An introduction to quantum theory and its concept

This is an excellent book written by an expert. Many books on quantum electrodynamics basically emphasize mathematical structures and computational techniques of the theory.

Chapters are not shown. CHAPTER THE TRIUMPH OF QUANTUM FIELD THEORY. In this chapter we present an overview of Quantum Field Theory. We will describe its structure and some of its many successes.

Providing a comprehensive introduction to quantum field theory, this textbook covers the development of particle physics from its foundations to the discovery of the Higgs boson.