Introduction of Modern Physics
The phrase modern physics denotes the post-Newtonian formation of physics. The word means that classical explanations of phenomena are lacking and that an exact, "modern", enlightenment of reality requires hypotheses to integrate elements of quantum mechanics or Einsteinian relativity or both. Overall, the term is used to pass on to any department of physics either developed in the prior 20th century and onwards or branches significantly prejudiced by early 20th century physics.
Modern physics often includes tremendous conditions; quantum effects typically include distances comparable to atoms (approximately 10-9 m), whilst relativistic effects typically engage velocities comparable to the speed of light (approximately 3x108 m/s). Small velocities and large distances is typically the area of classical mechanics.
Summary about Modern Physics
In a factual sense, the term modern physics means modernized physics. In this sense, a vital section of so-called classical physics is modern. Nonetheless, since approx 1890, new inventions have caused significant paradigm shifts; the advent of Quantum Mechanics and of Einsteinian relativity. Physics that incorporates elements of either QM or ER (or both) is said to be modern physics. It is in this latter sense that the word is generally used.
Modern physics is often encountered when dealing with incredible conditions. Quantum mechanical effects be likely to come into sight when dealing with "lows" (low temperatures, little distances), whilst relativistic effects be liable to appear when dealing with "highs" (high velocities, large distances), the "middles" being classical behaviour. For example, when analyzing the behaviour of a gas at room temperature, most phenomena will contain the (classical) Maxwell-Boltzmann distribution. Though near absolute zero, the Maxwell-Boltzmann distribution fails to account for the pragmatic behaviour of the gas and the (modern) Fermi-Dirac or Bose-Einstein distributions have to be used instead.
Very frequently, it is probable to find - or "retrieve" - the classical behaviour from the modern explanation by analyzing the modern explanation at low speeds and large distances (by taking an edge, or by making a rough calculation). When doing so, the aftereffect is called the classical limit.
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