Standing WavesInterference Over Time

Key Question

What would two identical waves, travelling in opposite directions look like when they interfere with each other?

Let’s See!!!

•Bell Wave Machine•Animationhttp://www.walter-fendt.de/ph14e/stwaverefl.htm

•A standing wave pattern is the result of the interference between two identical waves travelling in opposite directions

•How many wavelengths does each standing wave have?

•What is the relationship between number of nodes and wavelength?

• Copy down the board note

Labelling a Standing Wave

Nodal points or Nodes (N) •points in a standing wave pattern that remain at rest

•Spacing between nodes is equal to ½λ

•Complete destructive interference

Labelling a Standing Wave

Antinodes•points where constructive interference occurs creating double crests and double troughs