Step 1: Understanding the Concept:
Sound has three main characteristics: Loudness, Pitch, and Quality (or Timbre).
Step 2: Detailed Explanation:
1. Loudness depends on the amplitude of the vibration.
2. Pitch depends on the frequency of the vibration.
3. Quality (Timbre) is the characteristic that allows us to distinguish between two sounds of the same pitch and loudness produced by different instruments. This depends on the number and intensity of subsidiary notes (overtones) present, which determines the overall shape of the vibration, known as the waveform.
Step 3: Final Answer:
Quality of sound depends on its waveform.