Answer: Loudness.
- A Pitch
- B Frequency
- C Loudness
- D Quality
Correct answer: C. Loudness
Explanation: Loudness depends on amplitude. Greater amplitude means more energy and louder sound.
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.