I did this lesson for my older buddy class next door. It was an apology for making so much noise the week before. I was teaching my grade 2 class about how stringed instruments had evolved from lutes and mandolins to really loud electric guitars and basses. I made too much noise and totally disrupted the class next door. When I heard they were learning about sound in science anyway, I thought I could teach them a similar lesson, but from a science point of view instead of a historical one.
Later on, I found out that the lesson had impacted one of the students. It was the first time she really started to get the idea of sound as vibrations and waves. I told the students that sound comes from vibrations. They held their throats while they hummed different sounds. I showed them that sound travels out in waves by shaking and oscillating a long skipping rope but it really became clear when I showed them sound waves of my voice as I spoke, using an Oscilloscope app on my tablet.
This really got the attention of that student, who happens to be deaf. She could see that high pitched sounds had short fast waves and low loud sounds had long, large waves. And when I played my bass really loud she could feel the vibration go right through her body.
I am glad that the lesson was so successful for her. It is a great feather in my cap that I was able to help a deaf person understand some concepts about sound. BUT it is bittersweet because it was accidental, it wasn't my own class, and with the changes in curriculum, I don't know if I'll ever do that lesson again.
Still worth it.