1. Waves (3)
3Week 6-7

2. Amplitude
The wave height.

3. Decibel
The most common unit used to measure loudness (symbol dB).

4. Dissonance 
The auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience.  

5. Doppler Effect
An observed change in the frequency of a wave when the source or observer is moving.

6. Echo
A reflected sound wave.

7. Echolocation
The process of using reflected sound waves to find objects; used by animals such as bats.

8. Frequency
The number of waves that pass by a point each second.

9. Hertz
Pitch is measured in this.

10. Loudness
The extent to which a sound can be heard.

11. Medium
A substance through which a wave can travel.

12. Noise
A sound that consists of a random mix of frequencies.

13. Pitch
A measure of how high or low a sound is perceived to be, depending on the frequency of the sound wave.

14. Resonance
A phenomenon that occurs when two objects naturally vibrate at the same frequency; the sound produced by one object causes the other object to vibrate.

15. Sonic Boom
The explosive sound heard when a shock wave from an object traveling faster than the speed of sound reaches a person's ears.

16. Sound Wave
A longitudinal wave that is caused by vibrations and that travels through a material medium.

17. Timbre 
The distinctive property of a complex sound (a voice or noise or musical sound).

18. Ultrasound 
Using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth.

19. Vibration
A back and forth movement (that causes sound).