It is very hot at noon, and then we will go to the seaside to enjoy the sea breeze. When you stand on the beach, there may be waves lapping on the shore, or a large group of surfers fighting in the waves and feeling the excitement brought by speed-all these need waves to complete, because waves are a very common form of waves.

Last semester, we studied "sound propagation". Sound wave is a kind of wave, and the substance it propagates is a medium, and this wave that needs to propagate through the medium is a mechanical wave. To understand waves, we must start with understanding mechanical waves.

First of all, we should know that "when an energy source causes a medium to vibrate, a wave is generated (vibration is a repeated movement back and forth or up and down)." But when I saw this, my understanding of waves was a little vague, so I did an experiment according to the information on the Internet: I fixed one end of the rope on the door handle and held the other end in my hand, swinging it up and down, and I made a simple wave. Of course, we can also intuitively understand the propagation modes of other types of waves such as electromagnetic waves.

Later, it was learned from the data that the wave whose propagation direction is perpendicular to the moving direction of the medium particle is called shear wave, while the wave whose propagation direction is parallel to the moving direction of the medium particle is called longitudinal wave (such as spring), and there is another kind of surface wave, which is the combination of two kinds of waves and mostly occurs at the junction of two kinds of media. These waves are everywhere and are closely related to our lives!

Through this exploration, I have a clearer understanding of waves and know the most basic classification of waves.

I write this for your reference. I hope you can be inspired.

Note: please do not copy, respect copyright, thank you!

(supplement: you can also write "magic hormone" and "sound and light")