Answer: Nodes.
- A Antinodes
- B Nodes
- C Crests
- D Troughs
Correct answer: B. Nodes
Explanation: Nodes are points of zero displacement in a standing wave. Antinodes are points of maximum displacement.
A standing wave forms from two identical waves travelling in opposite directions and interfering; nodes (always zero displacement) and antinodes (maximum displacement) stay fixed in place, unlike a travelling wave where the whole pattern moves.
Concept context
Wave types, superposition, standing waves, Doppler effect, and sound intensity.