Marcus plucks at an outstretched coil and observes the wave motion. What is the motion of the particles in this kind of wave?

Plucking the outstretched coil creates a transverse wave: the disturbance travels along the coil while its particles move perpendicular to that direction. The particles oscillate up and down around their resting positions, moving only over small areas rather than traveling along with the wave. So the correct choice is “The particles will move up and down over small areas.”

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