Answer: 200 m/s.
- A 50 m/s
- B 100 m/s
- C 200 m/s
- D 400 m/s
Correct answer: C. 200 m/s
Explanation: v = f x lambda = 100 x 2 = 200 m/s.
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.