Answer: /4.
- A λ/4
- B λ/2
- C λ
- D λ/3
Correct answer: A. λ/4
Explanation: Nodes and antinodes alternate, spaced λ/4 apart. Consecutive nodes (or consecutive antinodes) are λ/2 apart, so a node to its neighbouring antinode is half of that, λ/4.
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.