CQ4


 * When a wave reflects off a boundary, what determines whether it is or is not inverted?**

A wave will reflect off a boundary as inverted or not depends on the boundary. If the boundary is a fixed boundary, meaning it does not move, like a string tied to a pole, then the wave will be inverted. If the boundary is not fixed and the wave can move up or down the boundary, then the wave will not be inverted.

If a crest is incident towards a fixed end boundary, it will reflect and return as a trough. Similarly, if a trough is incident towards a fixed end boundary, it will reflect and return as a crest.

Dylan Hoff and Katie Chiappini and Emily Bergen