What Is Sound?
In order to develop an understanding of what sound is, learners need to experience the investigations into
sound themselves. For this purpose, learners are introduced to vibrations as the source of sound before
embarking on an onscreen visit to the Sci-Bono Discovery Centre in Newtown, Johannesburg to look at a
number of ‘sound’ experiments. Learners should watch the experiments and then be asked to draw their own
conclusions about what these experiments are telling us about sound.The learners should observe that sound
travels through a medium, is reflected at boundaries and energy is transferred. We summarise our observations
in a simple model - sound always has a source, travels in a medium, and is interpreted by a receiver. The
receiver in humans is the ear. The learners are then guided through a model of the human ear so that they can
relate structure to function.