Martha gazes out the window of a moving train. Billboards, telephone poles, and other objects near the railway track move past Martha very quickly, while objects in the distance move slowly. This illustrates the depth cue of:.

This illustrates the depth cue of: motion parallax.

Explanation:

Parallax is an uprooting or contrast in the clear situation of an item saw along two unique views, and is estimated by the edge or semi-edge of tendency between those two lines.

Motion parallax is a monocular profundity sign emerging from the overall speeds of articles moving over the retinae of a moving individual. The term parallax alludes to an adjustment in position. In this way, movement parallax is an adjustment in position brought about by the development of the watcher.

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 .