Unit 9 - Waves and Sound

 Sound is a vibration that causes a longitudinal wave
Pitch is the frequency of sound, the higher the frequency, the higher the pitch, and vice versa. All frequencies travel at the same speed if it's at the same temperature.

One thing that I learned about waves and sound that's actually really applicable to my life would be about the waves in garage/gate openers. I know the exact spot that I can click my gate opener and have it work, and I know that if I'm just a little bit off of that spot then I'm too far away, and the waves won't reach my gate and open it. Mr. Blake told us that if you put your clicker on your elbow or by your head, then the frequency travels through you, basically using you as a human antenna so that the waves can travel further.

Here's how far away from my gate I can be normally, without holding the opener up to my elbow:

And here's how far away I can be when I do hold the opener up to my elbow: