| A | B |
|---|
| Pitch | The highness or lowness of a sound (but not how quiet or loud the sound is). |
| Volume | How quiet or loud a sound is. |
| Wavelength | The term scientists use to describe how ‘squished together’ or ‘spread out’ a wave is. |
| Vibration | Back-and-forth movement of something. |
| Oscilliscope | A device that shows sound waves like a graph, in a sideways view. |
| Wave | The traveling movement created by a vibration in water or air. |
| Vacuum Pump | A device that can remove the air from a container, allowing scientists to study what it’s like in outer space. |
| Frequency | The number of times per second that the wave cycles. |
| echo | a sound or series of sounds caused by the reflection of sound waves from a surface back to the listener |
| sound | vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear. |
| amplitude | the extent or range of a wave |
| compression | to reduce in size, quantity, or volume as if by squeezing |
