Node

Definition

A node is a point along a standing wave where the wave has minimal or zero amplitude due to destructive interference. Nodes occur at fixed intervals and are points of no displacement.

5 Must Know Facts For Your Next Test

1. Nodes are created by the superposition of two waves traveling in opposite directions.
2. In a standing wave, nodes are spaced by half the wavelength ($\lambda/2$).
3. Nodes represent points of destructive interference where two waves cancel each other out.
4. The number of nodes increases with higher harmonic frequencies.
5. In musical instruments, nodes correspond to points where the string or air column does not vibrate.

Review Questions

• What creates a node in a standing wave?
• How far apart are nodes typically spaced in terms of wavelength?
• Why do nodes occur at points of destructive interference?

Related terms

Antinode:

A point along a standing wave where the amplitude is greatest, occurring midway between nodes.

Wavelength:

The distance between successive crests, troughs, or identical parts of a wave.

Harmonic:

A frequency that is an integer multiple of the fundamental frequency; higher harmonics have more nodes and antinodes.