Sound
Practice Test
1.
When a train passes and its whistle sounds like it changes pitch, the cause is __________.
a.
the Doppler Effect
b.
the Big Bang
c.
the Galileo Effect
d.
speed change
Hint
2.
A wave that reflects off a flat surface will reflect at __________.
a.
a different angle from which it struck the surface
b.
a right angle to the surface
c.
an angle of zero
d.
the same angle at which it struck the surface
Hint
3.
If in Figure 15-12 the rightmost picture shows resonance for 325 Hz, what is the next highest frequency at which resonance will occur?
a.
390 Hz
b.
365 Hz
c.
455 Hz
d.
406 Hz
Hint
4.
In Figure 14-14, how do the frequencies of the waves in pictures a and c compare?
a.
a's frequency is half of c's.
b.
a's frequency is twice c's.
c.
a's frequency is four times c's.
d.
a's frequency is one-quarter of c's.
Hint
5.
A 75-kg rock climber first climbs 25 m to the top of a quarry, then descends 75 m from the top to the bottom of the quarry. If the initial height is the reference level, what is the potential energy of the system (climber plus Earth) at the top?
a.
1.8×10
4
J
b.
-1.8×10
4
J
c.
-3.7×10
4
J
d.
3.7×10
4
J
Hint
6.
In Figure 14-1, if the spring's constant is 20.0 N/m and x has a value of 0.25 m, what is m equal to?
a.
0.51 kg
b.
0.63 kg
c.
5.0 kg
d.
0.06 kg
Hint
7.
You are riding in a boat that is traveling 15.0 m/s in still water. You move from the bow to the stern at 3.0 m/s. What is your speed relative to the water?
a.
12.0 m/s relative to the water
b.
9.0 m/s relative to the water
c.
15.3 m/s relative to the water
d.
18.0 m/s relative to the water
Hint
8.
The equation that represents gravitational potential energy is __________.
a.
PE
g
=
E
+
KE
b.
PE
g
= 1/2
mv
2
c.
PE
g
=
mgh
d.
PE
g
=
Fd
Hint
9.
If in Figure 15-12 the rightmost picture shows resonance for 325 Hz, what is the fundamental frequency of the pipe?
a.
406 Hz
b.
65 Hz
c.
195 Hz
d.
325 Hz
Hint
10.
The frequency of a sound determines its __________.
a.
pitch
b.
timbre
c.
loudness
d.
speed
Hint
11.
In Figure 6-7, if the mass of the hammer is 7.26 kg, its center is 0.50 m from the thrower, and it is moving at a speed of 1.5 m/s, what is the tension in the chain?
a.
4.5 N
b.
33 N
c.
22 N
d.
3.0 N
Hint
12.
If standing on a scale in an elevator, as in Figure 4-9, and the scale reads 120% of your weight, what is the acceleration of the elevator?
a.
0.8
g
, up
b.
0.2
g
, down
c.
0.2
g
, up
d.
1.2
g
, down
Hint
13.
On Earth, a scale shows that you weigh 490 N. What is your mass?
a.
22 kg
b.
50 kg to 5.0×10
1
kg
c.
100 kg
d.
75 kg
Hint
14.
In Figure 14-2, if the scale of the graph is 1 block = 10 N on the vertical axis and one block = 2 cm on the horizontal axis, what is the spring constant?
a.
250 N/m
b.
500 N/m
c.
20 N/m
d.
5 N/m
Hint
15.
The principle of superposition states that __________.
a.
the energy of a wave depends on its position
b.
waves from different mediums can combine to form a new wave
c.
two or more waves can combine to form a new wave
d.
waves can never combine
Hint
16.
Which of the following situations is physically the most like that depicted in Figure 6-9a?
a.
You walk toward the rear of a forward-moving train.
b.
You step upwards on an upward-moving escalator.
c.
You jump up in an elevator that is going down.
d.
You slide to the right on the seat of a forward-moving bus.
Hint
17.
In Figure 6-7, if the mass of the hammer is 7.26 kg, its center is 0.50 m from the thrower, and it is moving at a speed of 1.5 m/s, what is the force of the chain on the thrower's hands?
a.
22 N, inward
b.
33 N, outward
c.
33 N, inward
d.
22 N, outward
Hint
18.
The speed of a wave depends on the __________.
a.
energy
b.
frequency
c.
amplitude
d.
medium
Hint
19.
A projectile's path through space is called its __________.
a.
period
b.
range
c.
trajectory
d.
flight plan
Hint
20.
You accidentally throw your car keys horizontally at 5.0 m/s from a cliff 45 m high. How far from the base of the cliff should you look for your keys?
a.
45 m
b.
135 m
c.
225 m
d.
15 m
Hint
