What are acoustically measurable quantities related to pitch and loudness ?

Explanation

### Step-by-Step Solution:

1. **Understanding Pitch**:
- Pitch is the quality of a sound that allows it to be classified as relatively high or low. It is primarily determined by the frequency of the sound wave.

2. **Identifying the Measurable Quantity for Pitch**:
- The acoustically measurable quantity related to pitch is **frequency**. Frequency is measured in Hertz (Hz) and refers to the number of cycles of a sound wave that occur in one second.
- Alternatively, **wavelength** can also be considered, as it is inversely related to frequency (higher frequency means shorter wavelength).
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