College Physics II – Mechanics, Sound, Oscillations, and Waves
Definition
An antinode is a point in a standing wave where the amplitude of oscillation is at its maximum. Antinodes occur at positions where constructive interference occurs.
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Antinodes are located between nodes in a standing wave pattern.
In a vibrating string fixed at both ends, antinodes are the points that move the most.
The distance between two consecutive antinodes is half the wavelength ($\lambda/2$).
Antinodes result from the constructive interference of two waves with the same frequency and amplitude traveling in opposite directions.
In sound waves within a tube open at both ends, antinodes form at the open ends.
Review Questions
Where do antinodes occur in a standing wave pattern?
What is the distance between two consecutive antinodes?
How do antinodes form as a result of wave interference?
Related terms
Node: A point in a standing wave where there is no displacement due to destructive interference.
Wavelength: The distance over which a wave's shape repeats, typically measured from crest to crest or trough to trough.
Standing Wave: A wave that remains stationary, characterized by nodes and antinodes formed by the superposition of two traveling waves moving in opposite directions.