Answer: 343 m/s.
- A 332 m/s
- B 340 m/s
- C 343 m/s
- D 350 m/s
Correct answer: C. 343 m/s
Explanation: v increases by about 0.6 m/s per degree Celsius. At 20°C: v = 332 + 0.6 x 20 = 344 m/s, approximately 343 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.