Sound

1. The time it takes for a sound to fade in a given space.
6. Organ responsible for detecting and processing sound waves.
10. Sound waves with frequencies below 20 Hz.
13. A wave that carries sound through a medium.
14. A type of wave where particles of the medium vibrate parallel to the wave direction.
18. The maximum displacement of particles in a wave.
23. Unwanted or harmful sounds in the environment.
24. The power carried by a sound wave per unit area.
27. The rate at which a sound wave travels through a medium.
29. A sequence of frequencies produced by a vibrating body.
30. Change in frequency or wavelength of sound due to motion of source or observer.

2. A measure of how much sound is absorbed by a surface.
3. The point where a sound wave reflects off a surface.
4. A method of varying frequency to encode signals in sound waves.
5. The pattern of motion created by vibrating particles.
7. A device used to produce specific vibrations to demonstrate sound.
8. Structures designed to reduce noise levels.
9. How high or low a sound seems to a listener.
11. The number of wave cycles that pass a point per second.
12. A logarithmic scale to measure sound intensity levels.
15. A method of varying amplitude to encode signals in sound waves.
16. Characteristics of materials that affect sound propagation.
17. The energy carried by sound waves.
19. Reflected sound that is heard distinctly after a delay.
20. The part of the human body responsible for hearing.
21. The frequency at which a system naturally oscillates with maximum amplitude.
22. Sound waves with frequencies above 20,000 Hz.
25. The mass per unit volume of a medium affecting sound propagation.
26. The distance between two consecutive crests or troughs in a wave.
28. The attribute of sound that allows differentiation between sounds of the same pitch and loudness.