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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energy, and the uncertainty principle and is generally used in single-body systems. Use the quantum-field-theory tag for the theory of many-body quantum-mechanical systems.

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On particle diffraction and its relation to the statistical interpretation of the wave function

In a section of Heisenberg's The Physical Principles of Quantum Theory; he emphasizes Duane's perspective on corpuscular picture of diffraction/reflection and points out for example for a grating, if …
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On particle diffraction and its relation to the statistical interpretation of the wave function

Particles can be diffracted due to their quantum nature and that is understood by their wave-like behavior. Clearly seen in e.g. plane wave solutions of the Schrodinger equation or a superposition of …
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How to fully understand the Definition of Entropy?

In thermodynamics, entropy is a state quantity. So, it is used to define a specific state of the system in the configuration space. First definition you gave is the Boltzmann Entropy and is only appli …
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