* Imagine a slinky: Stretch out a slinky and hold one end. If you push the slinky forward (compressing the coils), you create a compression. This compression then travels along the slinky.
* The slinky's coils move back and forth: Notice that the individual coils don't travel the whole length of the slinky. They simply move back and forth in the same direction that the compression travels.
* Sound is an example: Sound waves are longitudinal waves. Air molecules are pushed together (compressed) and pulled apart (rarefied) as the sound wave travels. The molecules themselves don't travel far; they vibrate back and forth in the same direction as the sound wave.
Here's a summary of the key characteristics of longitudinal wave motion:
* Parallel Motion: The particles of the medium move parallel to the direction of wave propagation.
* Compressions and Rarefactions: The medium is alternately compressed and rarefied (stretched out) as the wave passes through it.
* No Net Displacement: The particles of the medium do not move along with the wave. They oscillate around their equilibrium positions.
Let me know if you have any other questions!
