Loudspeakers work by converting electrical energy into kinetic energy. This vibrates the cone which creates the sound waves. Sound waves can reflect off surfaces. We hear reflected sound as an echo.

A ripple tank can be used to measure and calculate frequency, wavelength and the speed of waves on the surface of the water. A ripple tank is a transparent shallow tray of water with a light ...

Waves, tide, and wind dominate coastal processes and landforms. Rivers deliver sediment to the coast, where it can be reworked to form deltas, beaches, dunes, and barrier islands. The coastal zone ...