Newtonian, or classical physics applies to physical, every day things, while quantum physics is a type of theoretical physics that does not apply to any physical things.
The correspondence principle, articulated by Bohr in 1923, states that the behavior of quantum systems must reflect classical physics in the limit of large quantum numbers. This principle reconciles the differences between classical and quantum mechanics by showing that classical physics is a limiting case of quantum mechanics. It asserts that the predictions of quantum mechanics converge to classical physics predictions as the quantum numbers become large.
The Bell inequality in quantum mechanics is significant because it demonstrates that certain correlations between particles cannot be explained by classical physics theories. This challenges the idea that particles have predetermined properties and suggests that quantum mechanics operates differently from classical physics.
Classical physics fails to accurately describe phenomena at the quantum scale, like particles behaving as waves and existing in superpositions. Quantum mechanics, with principles like wave-particle duality and quantization of energy levels, provides a more comprehensive framework to explain such phenomena. Thus, the transition from classical to quantum physics occurs due to the limitations of classical physics in describing the behavior of particles at the quantum level.
classical physics and (Quantum or modern) Physics
Classical (or Newtonian) and Quantum.
In quantum mechanics, the classical turning point is a critical point where a particle's behavior transitions from classical to quantum. It marks the boundary between regions where classical physics and quantum mechanics are most applicable. This point is significant because it helps us understand how particles behave differently at the quantum level compared to the classical level.
Quantum mechanics is a branch of physics that deals with the behavior of particles at the smallest scales, while physics is a broader field that encompasses the study of matter, energy, and their interactions at all scales. Quantum mechanics introduces concepts such as superposition and entanglement that are not present in classical physics, and it has led to the development of technologies like quantum computing. Physics, on the other hand, includes classical mechanics, electromagnetism, thermodynamics, and other branches that do not rely on quantum principles.
Nothing. Quantum is a branch of physics
Quantum Mechanics "replaced" Classical Mechanics in particle physics in mid-1930s.
Franco Battaglia has written: 'Notes in classical and quantum physics' -- subject(s): Quantum theory, Physics
Classical physics is the physics without considering quantum mechanics. This is the type of physics practiced by for example Newton (you might also come across the term Newtonian physics). General relativity is also a classical theory. The distinction is often used because quantum mechanics changed quite a bit in many fields of physics, so the term 'classical physics' allows for a clear distinction. The opposite of classical physics would be quantum physics.
Physics Branches: Classical Mechanics Mathematical Physics Classical Electrodynamics Quantum Mechanics Thermodynamics and Statistical Mechanics Condensed Matter Physics Nuclear Physics Quantum Field theory Non-Linear Dynamics Astronomy and Astrophysics General Theory of Relativity and Cosmology