Which state of matter has very little particle motion

The solid state has the least particle motion.

The solid state of matter has the lowest energy, or particle motion.

Explanation:

Matter in its solid state has the lowest amount of thermal energy (for that type of matter). Because solids have less thermal energy than liquids or gasses, the atoms in their solid state move very little

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

c)as speed changes, wavelength and frequency change.

everything changes!