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Waves Study Guide 3:  26.5 - 27.8



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

 1. 

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
 

 2. 

A singer shattering crystal glass with her voice is a demonstration of
a.
beats.
b.
sound refraction.
c.
an echo.
d.
interference.
e.
resonance.
 

 3. 

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

 4. 

The phenomenon of beats results from sound
a.
interference.
b.
reflection.
c.
refraction.
d.
all of the above
e.
none of the above
 

 5. 

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
 

 6. 

The Tacoma Narrows Bridge collapsed due to
a.
resonance.
b.
frequency modulation.
c.
beats.
d.
destructive interference.
 

 7. 

Beats are produced when two tuning forks, one of frequency 240 Hz and the other of frequency 248 Hz, are sounded together. The frequency of the beats is
a.
8 Hz.
b.
16 Hz.
c.
240 Hz.
d.
247 Hz.
e.
none of the above
 

 8. 

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

 9. 

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

 10. 

Which of these electromagnetic waves has the shortest wavelength?
a.
Infrared waves
b.
Light waves
c.
Radio waves
d.
X-rays
e.
Ultraviolet waves
 

 11. 

Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is
a.
the same.
b.
shorter.
c.
longer.
 

 12. 

Compared to the velocity of radio waves, the velocity of visible light waves is
a.
slower.
b.
faster.
c.
the same.
 

 13. 

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
 

 14. 

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.
 

 15. 

The main difference between a radio wave and a sound wave is its
a.
basic nature.
b.
amplitude.
c.
energy.
d.
frequency.
e.
wavelength.
 

 16. 

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
 

 17. 

Which of the following is NOT an electromagnetic wave?
a.
Sound
b.
Radio
c.
Light
d.
Infrared
e.
X-ray
 

 18. 

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

 19. 

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

 20. 

Light waves are
a.
longitudinal waves.
b.
transverse waves.
 

 21. 

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

 22. 

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.
 

 23. 

Light reflected from a lake surface is polarized
a.
randomly.
b.
horizontally.
c.
vertically.
 

 24. 

If two polarizing filters are held with their polarization axes at right angles to each other, the amount of light transmitted is
a.
zero.
b.
half as much.
c.
the same.
d.
twice as much.
 

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

 25. 

When an object is forced to vibrate at its natural frequency, resonance occurs.
 

 26. 

Almost everything that exists has a natural frequency.
 

 27. 

Even a steel bridge can collapse because of resonance.
 

 28. 

When an object is disturbed slightly and then left alone, it vibrates at its natural frequency.
 

 29. 

According to Einstein, light consists of massless bundles of electromagnetic energy called photons.
 

 30. 

Energy emitted by vibrating electric charges is carried by electromagnetic waves.
 

 31. 

Polarization occurs when waves vibrate in a single direction.
 

 32. 

Light sometimes acts as a wave and sometimes as a particle.
 

 33. 

The distance light travels in one year is called a light-year.
 

 34. 

Electromagnetic heat waves are called ultraviolet waves.
 

 35. 

Infrared waves are responsible for sunburn.
 



 
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