Ultrasound (page 516)
7. Is the following sentence true or false? Ultrasound is sound at
frequencies that are lower than most people are
capable of
hearing.
8. Describe some applications of ultrasound.
The Doppler Effect (page 516)
9. Is the following sentence true or false? The Doppler effect is a
change in sound frequency caused by
motion of the sound
source,
motion of the listener, or both.
10. For a stationary observer, as a moving sound source approaches,
the observer will first hear a(n)
sound and then a(n)
moves away.
Hearing and the Ear (page 517)
frequency of
frequency as the source
Match each description with the appropriate region(s) of the ear.
Description
11. Sound is gathered and
focused here.
12. Nerve endings send signals
to the brain.
13. The eardrum is located at the
boundary between these two
regions of the ear.
14. Hammer, anvil, and stirrup
are located here.
15. Sound vibrations are amplified.
Region
a. outer ear
b. middle ear
c. inner ear
How Sound Is Reproduced (pages 518-519)
16. How is sound recorded?
17. Sound is reproduced by converting
into sound waves.
Music (page 521)
back
18. Is the following sentence true or false? Many musical instruments
vary pitch by changing the frequency of standing waves.
19. Theaters are designed to prevent "dead spots" where the volume
is reduced by
of reflected sound waves.
20. The response of a standing wave to another wave of the same
frequency is called