In a compression wave, particles in the medium move
a. perpendicular to the direction of the wave
c. in the same direction as the wave
b. opposite of the direction of the wave
d. in depends upon state of the medium
The particles through which compressional waves travel move in the same direction as the wave. This may be observed by fixing one end of a large spring and then compressing and extending the other end. The wave travels from one end to the other and the spring's parts move in the same direction.
