Question

What is the opposite of quantum physics?

Answer 1

Hint: To answer the above question first we need to have an understanding i.e. the basic fundamentals about quantum physics. Further we need to see if the theory of quantum physics contradicts any existing theory of physics. Hence by carrying out such analysis we will be able to figure out the antonym for quantum physics.

Complete step-by-step solution:
The most basic and fundamental idea of quantum physics is the concept of energy quantization. The theory of quantum physics is more dramatic at the microscopic level. At the microscopic level i.e. the particle has a wave nature which can be explained by De Broglie’s hypothesis. The wave nature of such particles is given by a complex wave function and hence it does not have any physical interpretation for complete satisfaction.
The wave function of quantum particles is obtained by solving Schrodinger's equation. One of the most bizarre results also obtained is that the particles have discrete energy values which is in contradiction to classical physics. But classically we know that a particle can have a continuous value of energy. But we cannot say that this contradicts the theory of quantum physics. In fact for higher energy states the results of quantum theory and the classical theory match. In fact we can derive Newton’s law of motion by solving Schrodinger's equation as well.
Therefore we can conclude that classical physics is a subset of quantum physics. And since it does not contradict the results of any theory it does not have an antonym.

Note:Classical physics is a good approximation of quantum physics for the set of phenomena that we observe. It is just that we are not used to the ideas of quantum physics. In fact the concept of energy quantization exists in the world that we are more used to, but the discreteness is almost so ridiculously small that we can consider it to be continuous.