1. Sound

2. Decibel: a unit for measuring the loudness of sounds.

3. Amplify: to make a sound louder

4. Frequency: the speed at which something vibrates. High-frequency vibrations are rapid vibrations.

5. Hertz: the unit of frequency equal to one vibration per second.

6. Inner, Middle, Outer Ear

7. Oscilloscope: an instrument used to measure the frequencies of sounds.

8. Pitch: how high or low a sound is

9. Sound receiver: something that detects sound.

10. Sound source: an object or material that vibrates in a way that makes sound.

11. Tension: the degree to which a material has been stretched.

12. Tune: to adjust the musical pitch.

13. Vibration: a rapid back-and- forth movement.