Sound is all about vibrations. The source of the sound vibrates,
bumping into the air molecules nearby, which in turn bump into
their neighbours and so forth. This results in a wave of
vibrations through the air to the eardrum, which in turn
vibrates. What the sound wave will sound like when it reaches
the ear depends on a number of things such as the medium it
travels through and the strength of the initial vibration. In
the following activities, students will use simple supplies to
create, visualize, and feel sound waves, investigate vibration
and its role in producing sound, and make their own percussion
instruments.