3.26 understand that sound waves are longitudinal waves and hoy they can be rejected, refracted and diffracted

Sound waves are longitudinal waves. They can be reflected by hard flat surfaces. Materials such as carpets and curtains act as absorbing surfaces (they absorb sounds rather than reflect them). Sound waves refract as they enter a different medium (the denser the a material, the more they speed up). Sound waves can also be diffracted through gaps and around obstacles (such as a wall).