types of sound waves
Sound waves are longitudinal waves which means that the particles vibrate in the same direction of travel. They are described as 'pulsing' through the medium. An example of a longitudinal wave is if you have a slinky and you push it forwards and backwards so that pulses go through the slinky. There are areas where the particles are close together (compression) and areas where the particles are spread out (rarefaction).
What type of sound wave is a sound wave in which the particles vibrate in the same direction?