On Thursday, the sound man came to visit us and taught us everything there is to know about sound.
First of all, we learnt about how quickly sound travels through the air (750 miles per hour). Even though this is fast, light travels even faster (750 million miles per hour). That is why we see lightning before we hear the thunder.
Next, we voted on whether sound can travel through the three states of matter. Some thought that it would and others thought that it wouldn’t. We already knew that sound can travel through the air, as we talk all the time. However, we were not so sure about liquids and gases.
When Ava tested the clicking toy under water, we discovered that sound can travel through water.
We used a tuning fork to test whether we could send sound through solids. Both Grace and Kevin could hear and feel the vibrations moving through the wooden stick, all the way to the wooden box. The stick acted like a bridge, taking the vibrations from one place to another. The wooden boxes amplified the sound. Would this make the sound louder or quieter? Comment your answer below.
Therefore, we found that sound can move through all three states of matter.
We tested lots of other things around the room to see if they would amplify the sound. We found that larger surfaces were better amplifiers than small surfaces! Hollow surfaces also made louder sounds.
Sam, the sound man, showed us how loud sounds make big sound waves, whereas smaller sounds make smaller sound waves.
Next, he showed us how to make musical instruments. He demonstrated how to build a wooden xylophone. We hope that we will be able to have a go at this sometime this half term. To do this, we need planks of wood of slightly different sizes and some foam to cushion the wood. If you have any at home, please bring them in!
Other useful items for musical instrument making: bicycle inner tubes, thick elastic bands, bouncy balls, wooden chopsticks and metal pipes (big and small).