Which of the following is not a characteristic of musical sound?

Options

A. Pitch
B. Wavelength
C. Quality
D. Loudness

Explanation

To determine which of the following is not a characteristic of musical sound, we can follow these steps:

### Step 1: Understand the Characteristics of Musical Sound
Musical sound has specific characteristics that define it. The primary characteristics include:
1. **Pitch**: This refers to how high or low a sound is. It is determined by the frequency of the sound wave.
2. **Quality (Timbre)**: This refers to the color or texture of the sound, which distinguishes different types of sound production (e.g., a piano vs. a violin).
3. **Loudness**: This refers to the perceived intensity of a sound, which is related to the amplitude of the sound wave.

### Step 2: Identify the Options Given
The question asks us to identify which option is NOT a characteristic of musical sound. The options typically include terms related to sound.

### Step 3: Analyze Each Option
- **Option 1: Pitch** - This is a characteristic of musical sound.
- **Option 2: Quality** - This is also a characteristic of musical sound.
- **Option 3: Loudness** - This is another characteristic of musical sound.
- **Option 4: Wavelength** - This is a physical property of sound waves but not a characteristic of musical sound.

### Step 4: Conclusion
Based on the analysis, the option that is NOT a characteristic of musical sound is **Wavelength**.

### Final Answer
The correct answer is **Wavelength**.

---