Answer: 2.
- A π/2
- B π
- C 2π
- D π/4
Correct answer: C. 2π
Explanation: A path difference of one full wavelength corresponds to a phase difference of 2π radians, since phase difference = (2π/λ) × path difference.
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.