19.1
19.2
19.3
19.4
19.5
Speed
p
= Frequency
q
y x Wavelength
g
19.6
Transverse Wave
Longitudinal Wave
19.7
Waves
with
different
frequencies
F = 1 hz
nodes
d
F = 2 hz
nodes
F = 3 hz
nodes
19.8
Interference
19.9
Doppler Effect
19.10
Bow Waves
Bow Wave
19.11
Sonic Boom
(shock wave)
19.12
-- Questions -MULTIPLE CHOICE
CHOICE.
Choose the one alternative that
best completes the statement or
answers the question.
19.13
1) A Doppler effect occurs when a source of sound moves
A) towards you.
B) away from you.
you
C) both of these.
D) none of these.
2) Some of a wave's energy dissipates as heat. In time, this will reduce
the wave's
A) amplitude.
B) frequency.
C) period
period.
D) wavelength.
E) speed.
19.14
3) Suppose a simple pendulum is suspended in an elevator. When the
elevator is accelerating upward, the frequency of the pendulum
A) doesn
doesn'tt change.
change
B) decreases.
C) increases.
4) Wave interference occurs for
A)) light
g waves.
B) water waves.
C) sound waves.
D) all of these.
these
E) none of these.
19.15
5) An observer on the ground hears a sonic boom which is created by an
airplane flying at a speed
A) just below the speed of sound.
sound
B) greater than the speed of sound.
C) equal to the speed of sound.
D)) all
ll off these.
h
E) none of these.
6) A wave barrier is produced when a wave source moves
A) faster than the waves it produces.
B) as fast as the waves it produces.
produces
C) nearly as fast as the waves it produces.
19.16
7) A fishing-boat captain returns to port saying, "It's rough out there the waves are 4 meters high." He probably means that the amplitude
of the waves is
A) 2 m.
B) 4 m.
C)) 3 m.
D) 1 m.
8) The stride of a horse depends somewhat on the pendulum-like swing
of its legs. This stride would be higher in frequency if more of the
mass in its legs were concentrated
A) towards its feet.
B) uniformly all along its legs.
C) halfway
h lf
up its
i legs.
l
D) in the upper part, nearer the horse's body.
E)) none of these.
19.17
9) A node is a position of
A) minimum amplitude.
B) maximum amplitude.
amplitude
10) The frequency of the second hand on a clock is
A)) 60 hertz.
h
B) 1/60 hertz.
C)) 1 hertz.
19.18
11) If at a concert you run toward the orchestra, the frequency of the
sound you hear will be
A) increased.
increased
B) neither decreased nor increased.
C) decreased.
12) The period of the second hand on a clock is
A)) 1 second.
B) 1/60 second.
C) 60 seconds.
D) 3600 seconds.
seconds
E) 12 hours.
19.19
13) To say that one wave is out of phase with another is to say that the
waves are
A) of different frequencies.
frequencies
B) out of step.
C) of different amplitudes.
D)) off different
diff
wavelengths.
l
h
E) all of these.
14) A pendulum clock at high altitudes runs
A) normally as it does at sea level.
B) fast.
fast
C) slow.
19.20
15) A tuning fork of frequency 200 hertz will resonate if a sound wave
incident on it has a frequency of
A) 100 hertz.
hertz
B) 400 hertz.
C) either of these.
D)) none off these.
h
16)) A bow wave is pproduced when a wave source moves
A) faster than the waves it produces.
B) nearly as fast as the waves it produces.
C) as fast as the waves it produces.
produces
19.21
-- Answers -MULTIPLE CHOICE
CHOICE.
The one alternative that best
completes the statement or
answers the question.
19.22
Chapter 19
1) Answer: C
2) Answer: A
3) Answer: C
4)) Answer: D
5) Answer: B
6)) Answer: B
7) Answer: A
8) Answer: D
9) Answer: A
10) Answer: B
11) Answer: A
12) Answer:
A
C
13) Answer: B
14)) Answer: C
15) Answer: A
16) Answer: A
19.23