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Waves Exam - 50 Questions

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

 1. 

The source of all wave motion is a
a.
region of variable high and low pressure.
b.
vibration.
c.
movement of matter.
d.
harmonic object.
 

 2. 

The time needed for a wave to make one complete cycle is its
a.
frequency.
b.
velocity.
c.
amplitude.
d.
period.
e.
wavelength.
 

 3. 

The distance between successive identical parts of a wave is called its
a.
frequency.
b.
period.
c.
velocity.
d.
amplitude.
e.
wavelength.
 

 4. 

The Hertz is a
a.
special radio wave.
b.
type of car.
c.
unit of period.
d.
unit of wavelength.
e.
unit of frequency.
 

 5. 

Sound is an example of a
a.
longitudinal wave.
b.
constructive wave.
c.
Doppler wave.
d.
transverse wave.
e.
standing wave.
 

 6. 

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves
a.
lengthens.
b.
stays the same.
c.
shortens.
 

 7. 

During a single period, the distance traveled by a wave is
a.
two wavelengths.
b.
one wavelength.
c.
one half wavelength.
 

 8. 

The period of an ocean wave is 10 seconds. What is the wave’s frequency?
a.
0.10 Hz
b.
5.0 Hz
c.
10.0 Hz
d.
20.0 Hz
e.
30.0 Hz
 

 9. 

A certain ocean wave has a frequency of 0.07 hertz and a wavelength of 10 meters. What is the wave’s speed?
a.
0.07 m/s
b.
0.70 m/s
c.
1.0 m/s
d.
10 m/s
e.
143 m/s
 

 10. 

A leaf on a pond oscillates up and down two complete cycles each second as a water wave passes. What is the wave's frequency?
a.
0.5 hertz
b.
1 hertz
c.
2 hertz
d.
3 hertz
e.
6 hertz
 

 11. 

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.
 

 12. 

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.
 

 13. 

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
 

 14. 

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

 15. 

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

 16. 

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.
 

 17. 

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

 18. 

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
 

 19. 

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

 20. 

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

 21. 

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
 

 22. 

Resonance occurs when
a.
sound changes speed in going from one medium to another.
b.
sound makes multiple reflections.
c.
the amplitude of a wave is amplified.
d.
an object is forced to vibrate at its natural frequency.
e.
all of the above
 

 23. 

Noise-canceling earphones are an example of
a.
constructive interference.
b.
destructive interference.
c.
beats.
d.
resonance.
 

 24. 

Beats can be heard when two tuning forks
a.
are sounded together.
b.
have almost the same frequency and are sounded together.
c.
have the same frequency and are sounded together.
d.
all of the above
e.
none of the above
 

 25. 

Electromagnetic waves are
a.
transverse waves.
b.
longitudinal waves.
 

 26. 

Electromagnetic waves
a.
need a medium to travel through.
b.
can travel through a vacuum.
 

 27. 

Which of the following are fundamentally different from the others?
a.
Gamma rays
b.
Radio waves
c.
Sound waves
d.
Light waves
e.
X-rays
 

 28. 

The main difference between a radio wave and a light wave is its
a.
speed.
b.
wavelength.
c.
both A and B
d.
none of the above.
 

 29. 

If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes
a.
to operate receiving equipment in the dark.
b.
for light to travel from the sun to Earth.
c.
for the sun to disappear.
d.
all of the above
e.
none of the above
 

 30. 

Heat lamps give off mostly
a.
X-rays.
b.
infrared waves.
c.
ultraviolet waves.
d.
microwaves.
e.
radio waves.
 

 31. 

Electromagnetic waves with higher frequencies have wavelengths that are
a.
shorter.
b.
longer.
 

 32. 

What is the ultimate source of electromagnetic waves?
a.
Vibrating atoms
b.
Vibrating molecules
c.
Radio sets
d.
Vibrating charged particles
e.
TV antennas
 

 33. 

The primary purpose of polarized sunglasses is_____.
a.
to block ultraviolet rays.
b.
to block infrared rays.
c.
to block glare from reflections.
d.
to look cool.
 

 34. 

Refraction occurs
a.
when a wave changes speed.
b.
only at a wave front.
c.
at any unpredictable time.
d.
only with light waves.
e.
all of the above
 

 35. 

You can hear noises a long distance away over water at night because
a.
of lowered temperature.
b.
water conducts sound better at night.
c.
sound is reflected off water more efficiently at night.
d.
of  refraction of sound in air.
 

 36. 

When you see a "wet spot" mirage on the road in front of you, you are most likely seeing
a.
water.
b.
hot air.
c.
a figment of your imagination.
d.
sky.
e.
none of the above
 

 37. 

The critical angle for a light from the bottom of a swimming pool shining upward toward the pool's surface is the angle
a.
where light is refracted so it just skims the pool surface.
b.
43 degrees.
c.
at which all light is refracted out of the pool.
d.
42 degrees.
e.
at which some light is reflected from the surface.
 

 38. 

When a light beam emerges from water into air, the average light speed
a.
remains the same.
b.
decreases.
c.
increases.
 

 39. 

Different colors of light travel at different speeds in a transparent medium. In a vacuum, different colors of light travel at
a.
the same speed.
b.
different speeds.
 

 40. 

The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light's
a.
transmission qualities.
b.
color (frequency).
c.
wave nature.
d.
particle nature.
 

 41. 

A beam of light travels fastest in
a.
air.
b.
water.
c.
plastic.
d.
glass.
e.
Its average speed is the same in each of the above.
 

 42. 

Which of the following is a consequence of the refraction of light?
a.
rainbows
b.
mirages
c.
internal reflection
d.
all of the above
e.
a & b above
 

 43. 

In a curved optical fiber, light
a.
gains energy in each internal reflection.
b.
internally reflects in a succession of straight-line paths.
c.
bends and follows the curve of the fiber.
d.
scatters in random directions from the fiber's inner surface.
 

 44. 

A rainbow nicely illustrates an example of light
a.
internal reflection.
b.
refraction.
c.
both A and B
d.
neither A nor B
 

 45. 

When a wave passes through an opening, some of the wave is bent. This phenomenon is called
a.
polarization.
b.
reflection.
c.
diffraction.
d.
refraction.
e.
interference.
 

 46. 

Diffraction occurs for
a.
radio waves.
b.
X-rays.
c.
light.
d.
electron beams.
e.
all of the above.
 

 47. 

Waves diffract the most when their wavelengths are
a.
long.
b.
short.
c.
neither of the above.
 

 48. 

When monochromatic light shines through two closely spaced narrow slits and onto a screen some distance away, the pattern on the screen has an interference pattern which has
a.
no light in it.
b.
two large bright spots.
c.
alternating dark and light bands.
d.
one large bright spot.
e.
none of the above
 

 49. 

Coherent light, like the light emitted by a laser  is many different rays of light all having the same
a.
frequency.
b.
wavelength.
c.
phase.
d.
direction.
e.
all of the above
 

 50. 

Interference can be shown by using
a.
water waves.
b.
light waves.
c.
sound waves.
d.
all of the above
e.
none of the above
 



 
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