Here's how it works:
* Compression: The particles in the medium get squeezed together, creating a region of high density.
* Rarefaction: The particles spread out, creating a region of low density.
* Wave Propagation: These compressions and rarefactions travel through the medium, causing the particles to oscillate back and forth along the same line as the wave's direction of travel.
Think of it like this:
Imagine a long spring. If you push one end of the spring, the coils will bunch together (compression). This bunching then travels down the spring, causing the coils to spread out (rarefaction) and then bunch together again. The coils themselves are moving back and forth, parallel to the direction the wave is traveling.
Examples of longitudinal waves:
* Sound waves: These travel through air, water, and solids by causing the particles of the medium to vibrate back and forth.
* Seismic waves: These travel through the Earth's crust and mantle, also causing particles to vibrate back and forth.
Let me know if you'd like to know more about transverse waves!
