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Waves Study Guide 2: 25.7 - 26.4



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

When two or more waves are at the same place at the same time, the resulting effect is called
a.
a standing wave.
b.
a Doppler wave.
c.
a shock wave.
d.
interference.
e.
a period.
 

 2. 

Where can you touch a standing wave on a rope without disturbing the wave?
a.
At a node
b.
At any place along the wave
c.
At an antinode
 

 3. 

Standing waves can be set up
a.
in organ pipes.
b.
by blowing across the top of a soda bottle.
c.
on strings of musical instruments.
d.
all of the above
e.
none of the above
 

 4. 

Suppose a bug is jiggling up and down and swimming towards you at the same time. Compared to the frequency at which the bug is emitting waves, the frequency of the waves reaching you is
a.
lower.
b.
higher.
c.
just the same.
 

 5. 

As the sound of a car's horn passes and recedes (goes away) from you, the pitch of the horn seems to
a.
increase.
b.
stay the same.
c.
decrease.
 

 6. 

The Doppler effect is the change in observed frequency due to
a.
the original frequency of the source.
b.
the type of medium the wave is in.
c.
the motion of the source or observer.
d.
the type of wave.
e.
all of the above
 

 7. 

When a sound source moves towards you, what happens to the wave speed?
a.
It decreases.
b.
It increases.
c.
It stays the same.
 

 8. 

An aircraft that flies faster than the speed of sound is said to be
a.
subsonic.
b.
supersonic.
c.
neither of the above
 

 9. 

The Doppler effect occurs when a source of sound moves
a.
away from you.
b.
toward you.
c.
both A and B
d.
none of the above
 

 10. 

A sound wave that has a higher frequency has a wavelength that is
a.
shorter.
b.
longer.
 

 11. 

Two waves arrive at the same place at the same time exactly in step with each other. Each wave has an amplitude of 2.5 m. The resulting wave has an amplitude of
a.
0.6 m.
b.
1.3 m.
c.
2.5 m.
d.
5.0 m.
e.
10.0 m.
 

 12. 

Compared to the speed of light, sound travels
a.
faster.
b.
at about the same speed.
c.
slower.
 

 13. 

Sound waves are produced by
a.
radio stations.
b.
vibrating objects.
c.
soft objects.
d.
objects under pressure.
e.
none of the above
 

 14. 

Sound waves in air are a series of
a.
periodic disturbances.
b.
periodic condensations (compressions) and rarefactions.
c.
high- and low-pressure regions.
d.
all of the above
e.
none of the above
 

 15. 

Which of the following would be most likely to transmit sound with the highest speed?
a.
Steel in a bridge
b.
Wood in a cabinet
c.
Water in the ocean
d.
Water in a swimming pool
e.
Air in your classroom
 

 16. 

A sound wave is a
a.
standing wave.
b.
longitudinal wave.
c.
transverse wave.
d.
shock wave.
e.
none of the above
 

 17. 

Sound waves cannot travel in
a.
steel.
b.
air.
c.
a vacuum.
d.
water.
e.
Sound can travel in all of the above.
 

 18. 

The speed of a sound wave depends on
a.
the air temperature.
b.
its frequency.
c.
its wavelength.
d.
all of the above
e.
none of the above
 

 19. 

Sound travels faster in air if the air is
a.
neither warm nor cold.
b.
cold.
c.
warm.
 

 20. 

In which one of the following does sound travel the fastest?
a.
Water
b.
Ice
c.
Steam
d.
Sound travels at the same speed in all of the above.
 

 21. 

An explosion occurs 340 km away. Given that sound travels at 340 m/s, the time the sound takes to reach you is
a.
1 s.
b.
10 s.
c.
100 s.
d.
200 s.
e.
more than 200 s.
 

 22. 

A 680-Hz sound wave travels at 340 m/s in air, with a wavelength of
a.
0.5 m.
b.
5 m.
c.
50 m.
d.
500 m.
e.
none of the above
 

True/False
Indicate whether the statement is true or false.
 

 23. 

When the high part of one wave fills in the low part of another wave, constructive interference occurs.
 

 24. 

Nodes in a standing wave normally remain stationary.
 

 25. 

If you tie a rope to a wall and shake the free end up and down just right, the reflected wave will be in and out of phase with the incident wave at fixed places along the rope and can form a standing wave.
 

 26. 

As a train sounding a horn goes away from you, both the sound speed and the pitch of the horn fall.
 

 27. 

As a light source is coming towards you, you see light of a frequency higher than the source it emits.
 

 28. 

A pulse of compressed air that is part of a sound wave is a rarefaction.
 

 29. 

Sound can travel through solids, liquids, gases, and even a vacuum.
 

 30. 

In order for sound from a speaker to reach a listener, air near the speaker must travel to the listener.
 

 31. 

The word "pitch" refers to the period of a sound wave.
 



 
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