the beauty of a radio

So on Friday before I went to sleep, I turned on the radio like I always do. Right before this I was attempting to be a good student and "study" for the ACT. But studying actually meant a very fast skim of the practice book that I got from the CCO. Anyways the last section was the science section. There was some chemistry and some biology but there was also physics. In the practice book, there was problems on circuits and stuff we just learned. So I closed my book and turned off the light and went to my bed. I was still thinking about physics in general because that was the last thing I was thinking of. So I go to turn on my radio and I realize that it has more than one physics topic in the way it works. Magnets and sound waves! (btw this isn't a picture of it when I realized there was physics in it...I just went to sleep that night =P) Anyways, I turn my radio on and "gimme love" is playing I think on 100.3 So I turn the volume up because I like that song a lot. By adjusting the volume, I change the amplitude of the wave because the louder I make it, the bigger the amplitude. But the frequency, and period of the wave stays the same. But the next song that came on I didn't really like so I remember changing it to 98.5 but that was on commercial so I put the station on 102.7. By changing stations, my radio was catching different waves with different frequencies. This is why the music changed. The second part I realized was the speakers. They work by using a permanent magnet and electro magnet. The flow of electricity is switched depending on the music and so therefore the poles of the electromagnet is switched. When this happens, the permanent magnet and electromagnet either attract or repel depending on the poles. This vibration causes the speakers to create sound waves with a certain frequency. So with high notes it just vibrates faster or the poles switch faster. I think it is so awesome that something that I use everyday can be so related to physics!