Waves in a Medium

The simulation shows how a disturbance introduced at one end of a medium propagates forward while the individual particles of the medium remain near their original positions, simply oscillating.

Students can pick among four media – a stadium crowd, a rope, water, or air – using buttons, choose a pulse or a continuous harmonic wave, and adjust frequency and wave speed with sliders. A switch lets them label crests and troughs (or compressions and rarefactions in air), and a pause button stops the motion. The highlighted particle P can be dragged to any location on the medium to see its motion.

By comparing the different media, learners observe the difference between transverse waves (crowd, rope, water surface) and longitudinal waves (air), see how wave speed depends on the medium, and relate frequency to wavelength. The activity reinforces core concepts of wave propagation, superposition, and energy transport.