Which of the following best describes a longitudinal wave? Select one:

- A disturbance that moves the medium perpendicular to its line of travel.
- A disturbance that moves the medium along its line of travel.
- A wave that is caused by regularly repeating disturbance of the medium.
- A disturbance that moves the medium outward in all directions from a center.

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s