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00:02:34 1 History
00:13:31 2 Mathematical formulations
00:26:19 3 Mathematically equivalent formulations of quantum mechanics
00:28:35 4 Interactions with other scientific theories
00:34:28 4.1 Quantum mechanics and classical physics
00:37:45 4.2 Copenhagen interpretation of quantum versus classical kinematics
00:42:24 4.3 General relativity and quantum mechanics
00:44:24 4.4 Attempts at a unified field theory
00:48:16 5 Philosophical implications
00:56:08 6 Applications
00:57:39 6.1 Electronics
00:59:33 6.2 Cryptography
01:00:37 6.3 Quantum computing
01:01:45 6.4 Macroscale quantum effects
01:02:51 6.5 Quantum theory
01:04:07 7 Examples
01:04:17 7.1 Free particle
01:06:35 7.2 Particle in a box
01:10:51 7.3 Finite potential well
01:11:11 7.4 Rectangular potential barrier
01:11:44 7.5 Harmonic oscillator
01:11:52 7.6 Step potential
01:15:13 8 See also
01:15:35 9 Notes
01:16:20 10 References
01:16:49 11 Further reading
01:20:45 12 External links
01:24:02 See also
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"I cannot teach anybody anything, I can only make them think."
- Socrates
SUMMARY
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Quantum mechanics (QM; also known as quantum physics, quantum theory, the wave mechanical model, or matrix mechanics), including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.Classical physics, the physics existing before quantum mechanics, describes nature at ordinary (macroscopic) scale. Most theories in classical physics can be derived from quantum mechanics as an approximation valid at large (macroscopic) scale.
Quantum mechanics differs from classical physics in that energy, momentum, angular momentum and other quantities of a bound system are restricted to discrete values (quantization); objects have characteristics of both particles and waves (wave-particle duality); and there are limits to the precision with which quantities can be measured (uncertainty principle).Quantum mechanics gradually arose from theories to explain observations which could not be reconciled with classical physics, such as Max Planck's solution in 1900 to the black-body radiation problem, and from the correspondence between energy and frequency in Albert Einstein's 1905 paper which explained the photoelectric effect. Early quantum theory was profoundly re-conceived in the mid-1920s by Erwin Schrödinger, Werner Heisenberg, Max Born and others. The modern theory is formulated in various specially developed mathematical formalisms. In one of them, a mathematical function, the wave function, provides information about the probability amplitude of position, momentum, and other physical properties of a particle.
Important applications of quantum theory include quantum chemistry, quantum optics, quantum computing, superconducting magnets, light-emitting diodes, and the laser, the transistor and semiconductors such as the microprocessor, medical and research imaging such as magnetic resonance imaging and electron microscopy. Explanations for many biological and physical phenomena are rooted in the nature of the chemical bond, most notably the macro-molecule DNA.
