We explored sound waves today so there was quite a bit of noise at home this morning. .
We learnt about how sound travels. And how things/objects and surfaces act as conductors.
The yarn + metal spoon + wooden spoon activity was pretty cool to me at least. When the wooden spoon hits the metal one it creates sound waves. These waves travel up the yarn and to the ear instead of just spreading in the air. Depending on the size of the spoon and the length of yarn, you will hear something like a bell or deeper sound like a gong. You can feel the vibration on your fingers as you hold the yarn. Also the sound will resonate because the yarn allows the sound to continue to travel. .
We also listened to our voices as we spoke through different materials around the house, cushions, towels, etc. deciding which was the best conductor.
We also tested for spaces which echoes. And why it echoes. Also spoke of animals that use echolocation. .
The next experiment is also a fun one and some of you may have caught all the banging in my stories. All you need is a spoonful of uncooked rice on top of a bowl sealed with plastic wrap. (Swipe to see video) Also a metal spoon and pan. .
The rice moves and jumps because of sound waves that are produced when the spoon hits the pan. These waves travel through the air and reaching the plastic wrap it vibrates causing the rice to move. .