sound waves

sound waves

1. water waves

   • if you throw a pebble into a pond ripples spread out from where it went in
     • the ripples are waves travelling through the water
   • the waves move in a transverse motion
     • the undulations (up and down movement) are 90° to the direction of travel

2. superposition

   • when 2 waves meet they affect each other
   • if the waves meet in step...
     • they will add together increasing the amplitude
   • if the waves meet out of step...
     • they subtract, cancelling each other out