Match the items on the left with their meaning on the right.

1. describing sound as high or low
256 vibrations per second
2. middle C on the piano
amplitude
3. the speed of sound
solids
4. the loudness of a sound
compression
5. the part of the sound wave where molecules of air are pushed together
pitch
6. sound travels through this medium faster than through air
1/5 mile per second
7. the source of all sound
vibrations