Complete each of the following sentences by choosing the correct term from the word bank.
loudness, echoes, pitch, noise, solids, sound quality, vibrations, wavelength frequency, wave, vacuum, amplitude, lesser, infrasonics, ultrasonics
Sound waves having frequencies more than 20,000 Hz are called ____________.

Explanation

To complete the sentence "Sound waves having frequencies more than 20,000 Hz are called ____________," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify the correct term that describes sound waves with frequencies greater than 20,000 Hz.

2. **Review the Word Bank**: The available terms in the word bank are:
- loudness
...