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The theory that describes the emission and absorption of electromagnetic radiation. Since it is a quantum theory the processes of emission and absorption are described in terms of the creation and disappearance of photons, with photons being created in emission processes and disappearing in absorption.

What does quantum theory explain?

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.

Who introduced the quantum theory of radiation?

Planck The quantum theory of absorption and emission of radiation announced in 1900 by Planck ushered in the era of modern physics.

What does quantum mean in quantum theory?

Quantum is the Latin word for amount and, in modern understanding, means the smallest possible discrete unit of any physical property, such as energy or matter.

What are the basic postulates of quantum theory of radiation?

Postulates of Planck's quantum theory The energy is not radiated or emitted continuously. It is emitted in small proportions in the form of energy packets called quanta. 2. Radiation when in the form of light, each particle is known as a photon.

What do you mean by quantum?

Quantum is the Latin word for amount and, in modern understanding, means the smallest possible discrete unit of any physical property, such as energy or matter. Quantum came into the latter usage in 1900, when the physicist Max Planck used it in a presentation to the German Physical Society.

Why do we need quantum theory?

Quantum theory is needed because many phenomena at the microscopic level can not be explained using classical theory, eg: Photoelectric effect, interaction among elementary particles.

What is the first quantum revolution?

The first quantum revolution nearly a century ago led to the 20th-century technological revolution, which was based on the transistor, laser, and atomic clock. These inventions gave us computers, optical fiber communication, and the global positioning system, all of which are vital to the world economy.

Why is it called quantum?

It's right there in the name– the word "quantum" comes from the Latin for "how much" and reflects the fact that quantum models always involve something coming in discrete amounts. The energy contained in a quantum field comes in integer multiples of some fundamental energy.

What is a quantum give two examples?

A quantum is an indivisible unit of something – the smallest "package that it comes in." There are many examples: a photon of light, a molecule of water (in the sense that if you divide it, you don't have water anymore). Cash is quantized – the penny is the smallest unit of U.S. currency.