Here's why:
* Standing Waves: Standing waves are formed by the superposition (combination) of two waves traveling in opposite directions with the same frequency and amplitude.
* Interference: At some points, the waves interfere constructively, resulting in a maximum amplitude (antinode). At other points, they interfere destructively, resulting in zero amplitude (node).
* Fixed Points: Nodes are fixed points in space where the displacement of the medium is always zero.
Think of a vibrating guitar string. The string appears to stand still at certain points, while vibrating strongly at others. The still points are the nodes.
