Skillful 3 R&W - Unit 9 - Reading 1 Vocab

A sound that is reflected back to its source.

To bounce back. Here, it means the sound hits a surface and returns to the source.

6.

The force exerted by air in the atmosphere, which is affected by sound waves.

To soak up or take in. In the context of the text, some materials take in the sound and stop it from bouncing.

1.

Rapid back-and-forth movement in the air that causes sound.

3.

5.

2.

4.

To develop or progress; here, it refers to how understanding of sound improved.

A wave of compression and rarefaction through which sound travels in air or another medium.

8.

7.

To decide or define something. Here, it means to define the frequency of sound.