Question

multiple choice question
a standing wave results when the position(s) of
o a wave trough reaches the minimum displacement from the rest position
o nodes and antinodes switch at irregular intervals
o a wave crest reaches its maximum displacement from the rest position
o nodes and antinodes remain constant

Explanation:

A standing wave is formed by the superposition of two waves (usually a wave and its reflection). Nodes are points of zero displacement and antinodes are points of maximum displacement. In a standing wave, the positions of nodes and antinodes do not change over time. A wave trough reaching minimum displacement or a wave crest reaching maximum displacement is just a property of a single - wave (not specific to standing waves). Nodes and antinodes in a standing wave do not switch at irregular intervals.

Answer:

nodes and antinodes remain constant