KS3 Science Revision

Sound travels in longitude waves. This means that the particles hit each other in a parallel line. It also means that space needs a medium (water or air) to travel and it cannot travel in space. A sound can be reflected or refracted like light. Sounds can also be absorbed. Soft things like carpets are good at absorbing sound. The speed of sound depends on what it's passing through. The more particles, the quicker it will travel. Generally, sound travels fastest in solids. The frequency of sound is the number of complete waves that pass a point per second. Frequency is a measure of how high or low the pitch is and is measured in hertz (htz).