So far WikiMechanics has considered a generic particle P by objectifying some chain of events $\Psi$ written as

$\Psi ^{\sf{P}} = \left( \sf{\Omega} _{1} , \sf{\Omega} _{2} , \sf{\Omega} _{3} \ldots \right)$

The events $\sf{\Omega}$ are defined by sensation, and they are supposed to be very repetitive so that P can be recognized, $\ \sf{\Omega} _{1} = \sf{\Omega} _{2} = \sf{\Omega} _{3} \ \ldots$ etc. But we might just as well understand such a recurring sequence of sensations to be a**wave**train. That is, $\Psi$ could represent some sort of of periodically undulating or fluctuating perception. This interpretive ambivalence is called wave-particle duality and it has been contentious during the development of physics. However for WikiMechanics there is no quandary; scientific facts and theories are founded on sensation, and whether we call these perceptions

*particles*or

*waves*is just a question of convenience. If feelings are localized, then we talk about particles. Or if sensory phenomena seem to have some extended quality, then we often use words like

*wave*,

*wavenumber*,

*wavelength*, etc. In between, we might speak of particles that are in

*excited states.*These terms are developed from a discussion of quarks as follows.

Let each orbital cycle of P be a bundle of $N$ quarks

$\sf{\Omega}^{\sf{P}} = \left\{ \sf{q}^{\sf{1}}, \sf{q}^{\sf{2}} \ldots \sf{q}^{\it{i}} \ldots \sf{q}^{\it{N}} \right\}$

And let each quark be described by its phase $\delta _{\theta}$ along with its radius vectpr $\overline{\rho}$. Definition: the **wavevector** of P is

$\begin{align} \overline{\kappa} \equiv \left( \frac{1}{\rho_{\LARGE{\bullet}}^{2}} - \frac{1}{\rho_{\LARGE{\circ}}^{2}} \right) \sum_{i=1} ^{N} \delta _{\theta}^{\, i} \; \overline{\rho}^{i} \end{align}$

where $\rho_{\LARGE{\bullet}}$ is the inner radius and $\rho_{\LARGE{\circ}}$ is the outer radius of P. Substituting-in the definitions for these radii gives the wavevector in terms of quark coefficients as

$\begin{align} \overline{\kappa} = \frac{ k_{\sf{F}}}{hc} \left[ \left( \frac{8}{ \Delta n^{\sf{D}} } \right)^{2} - \left( \frac{8}{ N^{\sf{D}} } \right)^{2} \right] \cdot \sum_{i=1} ^{N} \delta _{\theta}^{\, i} \; \overline{\rho}^{i} \end{align}$

But for a perfectly free particle, $\left| \Delta n^{\sf{D}} \right| = 8$ and $N^{\sf{D}} \! \to ∞$. So the wavevector of a free particle can be put plainly as

$\begin{align} \overline{\kappa} = \frac{ k_{\sf{F}} }{ hc} \sum_{i=1} ^{N} \delta _{\theta}^{\, i} \; \overline{\rho}^{i} \end{align}$

Note that $\overline{\kappa}$ is a relative characteristic because the phase depends on the juxtaposition of P with some frame of reference. Let this frame be steady so that quarks do not change phase. Then if some free particles interact like $\mathbb{X} + \mathbb{Y} \leftrightarrow \mathbb{Z}$ their wavevectors will combine as

$\overline{\kappa}^{ \mathbb{X}} + \overline{\kappa}^{\mathbb{Y}} = \overline{\kappa}^{\mathbb{Z}}$

because quarks are indestructible and $\overline{\rho}$ is defined from sums and differences of quark coefficients. The radius vector also relates particles and anti-particles as $\, \overline{\rho} {\sf{(P)}} = - \overline{\rho} \sf{(\overline{P})}$. So if quarks are swapped with anti-quarks without altering the phase, then

$\overline{\kappa} \left( \sf{P} \right) = - \, \overline{\kappa} \left( \overline{\sf{P}} \right)$

Definition: The **average wavevector** describes some hypothetical typical quark in P using the ratios $\tilde{\kappa} \equiv \overline{\kappa} / N$ where $N$ is the total number of all types of quarks in P. Definition: A **wavenumber** is the norm of a wavevector, and written without an overline as $\kappa \equiv \left\| \, \overline{\kappa} \, \right\|$. Definition: The **wavelength** of P is

$\lambda \equiv \begin{cases} \ \ \ 0 \ &\sf{\text{if}} \ &\kappa =0 \\ \ 2 \pi / \kappa \ &\sf{\text{if}} \ &\kappa \ne 0 \end{cases}$