2. Slinky Waves A wave is caused by a vibrating source, and travels outwards from the source. The particles of the medium through which a wave travels move about their equilibrium positions; they do not move along with the wave. Energy is transferred from place to place by a wave.
14. Polarisation Polarisation can only happen with transverse waves http://www.youtube.com/watch?v=qlRriWu1zOI&feature=related http://www.youtube.com/watch?v=ozTH2zIKwC0&feature=player_embedded