2. The ear and brain perceive the amplitude as ____________.

3. The velocity of sound in air at sea level at room temperature (20 degrees C) is _________.

4. The velocity of sound equals its wavelength times the __________.

5. The frequency of a sound wave is called its _________.

6. The relative intensity of a sound pressure wave is measured on a scale of _________. 

7. The ____________ is the change in frequency of sound caused by motion.

8. Sound is a ____________ wave transmitted through a gas, liquid, or solid.

9. How fast does a 24 Hz tone with a wavelength of 960 m travel in air?

10. Most sounds consist of waves with _____________ frequency. 

11. The quality of the wave is called its ________________.

12. An air column can resonate with a sound source, _________ the loudness of the source.

13.  What is the intensity you receive when 50 w of sound are produced 2 m away?

14. Two waves with almost the same frequency interfere to produce ____________. 

15. Sound _______________ convert sound energy into a different form of energy.

16. The timbre of a musical instrument depends on the number and intensity of the __________ it produces.

17. The shape of the throat and mouth cavity determine the ____________ produced by the human voice.

18. What is the wavelength of a 5000 Hz tone at room temperature?

19. Sound is produced by ___________ objects.

20. How far away is a 900 w sound source that produces an intensity of 0.4 w/m2?

21. Which frequency is inaudible to humans?

22. The low density region of sound waves are called ________________.

23. Sound will travel fastest through _________________.

24. If the sound level increases from 90 to 100 dB, how much does the volume increase?

25. Sound waves below 20 Hz are called _____________.