In the realm of quantum mechanics, the concept of "point particles" is a theoretical construct used to simplify mathematical descriptions of particles. It represents the idea that particles can be treated as dimensionless points in certain calculations. However, it is important to understand that this does not mean that particles are physically devoid of size or structure.
The wave-particle duality in quantum mechanics suggests that particles can exhibit both wave-like and particle-like behavior. This duality is supported by a vast body of experimental evidence, including the famous double-slit experiment, which demonstrates the interference patterns characteristic of waves.
While experiments have revealed wave-like behavior of particles, it is crucial to note that this doesn't negate the existence of particles as localized entities. Quantum particles can still exhibit particle-like characteristics, such as interactions at specific points in space, detection at discrete positions, and particle counting. These behaviors have been observed and confirmed through various experiments and measurements.
Moreover, certain experiments, such as high-energy particle collisions, have provided evidence for the existence of subatomic constituents with a finite size and structure. For example, experiments conducted at particle accelerators, such as the Large Hadron Collider (LHC), have revealed subatomic particles that are not point-like but have measurable sizes and internal substructure.
It is essential to approach scientific concepts and theories with an understanding that they are models and representations of reality, constructed based on experimental observations and mathematical frameworks. While the notion of point particles simplifies calculations and theoretical descriptions, the physical reality of particles is more complex and encompasses both wave-like and particle-like aspects.
In summary, while point particles are a theoretical concept, experimental evidence supports the existence of particles with finite size and structure, and their behavior exhibits both wave-like and particle-like characteristics in different experimental contexts.