Sound

1. The decibel is used to measure a sound’s (a)   .

• A. pitch.
• B. loudness.
• C. frequency

3. Sound waves are produced by _________ in matter.

• A. echoes
• B. vibrations
• C. changes in state

A sound wave is a series of compressions and (a)   ?

• A. echoes
• B. troughs
• C. rarefactions

5. Sound waves with a greater frequency have a higher

• A. pitch
• B. volume
• C. amplitude

6. What is a longitudinal wave?

• a wave in which particles in matter move in the same direction as the wave
• a wave in which particles in matter move perpendicular to the direction of the wave
• a wave in which the electromagnetic field changes in the same direction as the wave
• a wave in which the electromagnetic field changes perpendicular to the direction of the wave

7. This image shows oscilloscope readings of three sound waves. Which wave has the highest frequency?

• wave A
• Wave B
• Wave C
• More information is needed

13. If a wave travels 30 m in 6 seconds, what is the speed of the wave?

• 5 m/s
• 36 m/s
• 180 m/s

14. At 330 m/s, how far would sound travel in 0.5 seconds?

• 330.5 m/s
• 165 m/s
• 660 m/s

15. How fast is the sound wave traveling if it travels 4,000 m in 5 s?

• 4005 m/s
• 20,000 m/s
• 800 m/s

16. What is the speed of sound in water if it travels 10,479 m in 7 s?

• 1,497 m/s
• 73, 353 m/s
• 10,472 m/s