Answer: Pitch.
- A Loudness
- B Pitch
- C Quality
- D Speed
Correct answer: B. Pitch
Explanation: Pitch is the perceptual quality determined by frequency. Higher frequency = higher pitch.
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.