We don't notice the wavelength of moving matter in our common experience. Is this because the wavelength is extraordinarily large or extraordinarily small?

Small. When masses are represented as a superposition of matter waves, they tend to exhibit more particle-like behavior when the wevelengths are short. Diffraction angles, for example, are less

The reason we don't notice the wavelength of moving matter in our common experience is primarily because the wavelength is extraordinarily small.

The concept of wavelength is closely related to the behavior of waves, which can be observed in various phenomena such as light, sound, and water waves. Wavelength refers to the distance between two consecutive crests or troughs of a wave. For example, in the case of light waves, different colors correspond to different wavelengths.

When it comes to matter, such as objects or particles in motion, they also possess a wavelength. This property, known as de Broglie wavelength, is described by the de Broglie equation: λ = h/(mv), where λ is the wavelength, h is the Planck constant, m is the mass of the object, and v is its velocity.

In our common experience, the objects or particles we encounter in everyday life have relatively large masses compared to fundamental particles like electrons or photons. Since the wavelength is inversely proportional to the mass of the object, the de Broglie wavelength of everyday, macroscopic objects becomes incredibly small and hard to detect.

For instance, if we were to calculate the de Broglie wavelength of a person walking at a typical speed of a few meters per second, the resulting wavelength would be so minuscule that it falls far beyond the range of our sensory capabilities. Hence, in our day-to-day experiences, we do not notice the wavelength of moving matter because it is extraordinarily small.