What is the main difference between "classical physics" and "quantum physics"?

Question

Quizplus · Accepted Answer

The main difference between classical physics and quantum physics is that in quantum physics, energy is quantized, meaning only certain, allowed values for energy can be used. In classical physics, energy can take on any value. This difference is the foundation of many of the strange and counterintuitive behaviors that occur at the quantum level. Options A and D are incorrect because they do not accurately describe the main difference between the two branches of physics. Option B is partly correct, but it does not apply only to classical physics, as there are other areas of physics where quantized energy levels are important (such as atomic and molecular physics).

What Is the Main Difference Between "Classical Physics" and "Quantum