Telephone Exchange

In our science this week we have been thinking about sound and how it travels. We thought our voices travelled fairly well through the air  but we discovered that actually sound travels much better through liquids and even more so through solids. This is because the molecules in solids and liquids are more closely packed together which allows the sound waves to move through them much quicker. We tested this by making string and cup telephones and were amazed to find that we could hook the whole class up and if we held the strings tightly enough we could all hear when someone spoke! We could also feel the vibrations travelling down the string as we spoke and learnt that all sounds occur due to vibrations.