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actually, classical physics can be formulated as an approximation of the laws of quantum theory, where the Planck constant tends to 0.
Max Planck
Classical Mechanics and Wave Theory.
Franco Battaglia has written: 'Notes in classical and quantum physics' -- subject(s): Quantum theory, Physics
Classical free electron theory could not explain many physical properties. In 1928, Sommerfeld developed a new theory applying quantum mechanical concepts and Fermi-Dirac statistics to the free electrons in the metal. This theory is called quantum free electron theory.
Quantum Mechanics
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
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
Max Planck invented the quantum theory of black body radiation and modern physics.
Richard Feynman stated once that "if you think you understand quantum mechanics then you don't understand quantum mechanics". However it is possible to learn how to write and solve the equations of quantum mechanics to get answers that can be verified experimentally.
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.
Quantum theory, the idea that energy is emitted in discrete quanta, contrary to classical physical theory.