**What Is Quantum Physics?**

## Overview

Quantum physics is the study of matter and energy at the atomic and subatomic level. It is one of the two pillars of modern physics, along with classical physics. Quantum physics differs from classical physics in many ways, including:

**Quantization:**Energy, momentum, angular momentum, and other quantities of a bound system are restricted to discrete values.**Wave-particle duality:**Objects have characteristics of both particles and waves.**The uncertainty principle:**It is impossible to know both the position and momentum of a particle with perfect accuracy.

## History of quantum physics

Quantum physics emerged in the early 20th century as a result of a number of experimental discoveries that could not be explained by classical physics. These discoveries included:

- The blackbody spectrum: The distribution of electromagnetic radiation emitted by a hot object could not be explained by classical physics.
- The photoelectric effect: When light shines on a metal surface, electrons are ejected. The energy of the ejected electrons depends on the frequency of the light, but not on its intensity. This could not be explained by classical physics, which predicted that the energy of the ejected electrons should depend on the intensity of the light.
- The line spectra of atoms: Atoms emit and absorb light at specific frequencies, which form a line spectrum. This could not be explained by classical physics, which predicted that atoms should emit and absorb light at a continuous range of frequencies.

In order to explain these experimental results, physicists had to develop a new theory of physics. This theory became known as quantum physics.

## Key concepts in quantum physics

Some of the key concepts in quantum physics include:

**Quantization:**Energy, momentum, angular momentum, and other quantities of a bound system are restricted to discrete values. This means that particles can only have certain energies, momentum, and angular momentum values.**Wave-particle duality:**Objects have characteristics of both particles and waves. This means that particles can behave like waves in some experiments and like particles in other experiments.**The uncertainty principle:**It is impossible to know both the position and momentum of a particle with perfect accuracy. This means that there is a fundamental limit to how accurately we can measure the position and momentum of a particle.**Superposition:**A particle can be in multiple states at the same time until it is measured. For example, an electron can be in a superposition of two different energy levels until it is measured.**Entanglement:**Two or more particles can be linked together in such a way that they share the same fate, even if they are separated by a large distance.

## Applications of quantum physics

Quantum physics has many applications in the real world. Some examples include:

**Lasers:**Lasers work by using quantum physics to amplify light. Lasers are used in a wide variety of applications, including medicine, industry, and communications.**Transistors:**Transistors are the basic building blocks of modern electronics. Transistors work by using quantum physics to control the flow of electricity.**Quantum computers:**Quantum computers are a new type of computer that uses quantum physics to perform calculations. Quantum computers have the potential to be much faster than traditional computers.

## Conclusion

Quantum physics is a fundamental theory that describes the behavior of matter and energy at the atomic and subatomic level. It is a complex and challenging subject, but it is also one of the most important and exciting areas of physics today. Quantum physics has many applications in the real world, including lasers, transistors, and quantum computers.

## Keyword silo

- Quantum physics
- Quantum mechanics
- Wave-particle duality
- Quantization
- Uncertainty principle
- Superposition
- Entanglement
- Lasers
- Transistors
- Quantum computers

## HTML format

`<h2>What Is Quantum Physics?</h2> <p>Quantum physics is the study of matter and energy at the atomic and subatomic level. It is one of the two pillars of modern physics, along with classical physics. Quantum physics differs from classical physics in many ways, including:</p> <ul> <li>Quantization: Energy, momentum, angular momentum, and other quantities of a bound system are restricted to discrete values.</li> <li>Wave-particle duality: Objects have characteristics of both particles and waves.</li> <li>The uncertainty principle: It is impossible to know both the position and momentum of a particle with perfect accuracy.</li> </ul> `

**History of quantum physics

WebThis unit is part of the Physics library. Browse videos, articles, and exercises by topic. WebQuantum, in physics, discrete natural unit, or packet, of energy, charge, angular momentum, or other physical property. Light, for example, appearing in some. WebQuantum physics is the branch of physics that deals with small objects and the quantization of various entities, including energy and angular momentum. Just as with classical. WebThis is the first course in the undergraduate Quantum Physics sequence. It introduces the basic features of quantum mechanics. It covers the experimental basis of quantum.

## Everything you need to know about quantum physics (almost) – BBC Science Focus Magazine

Source: Everything you need to know about quantum physics (almost) – BBC Science Focus Magazine

## Quantum Physics for Beginners: The Ultimate Guide to discover the Secrets of Quantum Mechanics, Understand Essential Theories Like the Theory of Relativity, … the Entanglement Theory. (English Edition) eBook : Smith, Daniel :

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What Is Quantum Physics, Brian Cox explains quantum mechanics in 60 seconds – BBC News, 1.88 MB, 01:22, 6,644,430, BBC News, 2014-09-23T11:05:28.000000Z, 9, Everything you need to know about quantum physics (almost) – BBC Science Focus Magazine, Everything you need to know about quantum physics (almost) – BBC Science Focus Magazine, 530 x 940, jpg, , 10, what-is-quantum-physics

**What Is Quantum Physics**.

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British physicist Brian Cox is challenged by the presenter of Radio 4’s ‘Life Scientific’, Jim Al-Khalili, to explain the rules of quantum mechanics in just a minute. Brian succeeds; while conceding that the idea that everything is inherently probabilistic, is challenging. Even Einstein found it difficult.

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### Everything you need to know about quantum physics (almost) – BBC Science Focus Magazine

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### What is quantum physics definition

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*What is quantum physics for dummies* The mathematical description of a quantum system typically takes the form of a “wavefunction,” generally represented in equations by the Greek letter psi: Ψ. There’s a lot of debate about what, exactly, this wavefunction represents, breaking down into two main camps: those who think of the wavefunction as a real physical thing (the jargon term for these is , What is quantum physics and how does it work.

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