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Waves Study Guide 4:  Ch 29



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

 1. 

An echo occurs when sound
a.
is transmitted through a surface.
b.
is reflected from a distant surface.
c.
changes speed when it strikes a distant surface.
d.
all of the above
e.
none of the above
 

 2. 

Refraction is caused by
a.
different wave speeds.
b.
more than one reflection.
c.
displaced images.
d.
bending.
 

 3. 

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
 

 4. 

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.
 

 5. 

A mirage can occur
a.
when cooler air is above hotter air.
b.
when there’s a layer of hot air close to the ground.
c.
on a hot day.
d.
all of the above
e.
none of the above
 

 6. 

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
 

 7. 

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.
 

 8. 

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

 9. 

The effect that we call a mirage has most to do with
a.
reflection.
b.
refraction.
c.
diffraction.
d.
interference.
e.
scattering.
 

 10. 

A person standing waist-deep in a swimming pool appears to have short legs because of light
a.
refraction.
b.
interference.
c.
diffraction.
d.
reflection.
e.
absorption.
 

 11. 

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.
 

 12. 

The explanation for a filled root beer mug looking fuller than it is involves
a.
refraction.
b.
reflection.
c.
both
d.
neither
 

 13. 

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.
 

 14. 

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.
 

 15. 

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
 

 16. 

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.
 

 17. 

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

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

 18. 

Reflection occurs when one part of a wave travels more slowly than another part.
 

 19. 

Mirages occur because of the reflection of light on a hot day.
 

 20. 

The separation of light into colors arranged according to their frequency is dispersion.
 

 21. 

The critical angle is the angle at which light just grazes the surface of a substance
 

 22. 

Total internal reflection occurs when a light ray hits a surface at an angle greater than the critical angle.
 

 23. 

When a wave reaches a boundary between two media, in most cases some of the wave is reflected and some is refracted.
 

 24. 

A line perpendicular to a surface is called a normal line.
 

 25. 

A line that represents the position of a wave crest is called a wave front.
 

 26. 

Sometimes a dry hot road will appear to be wet because of atmospheric refraction.
 

 27. 

When you shine a waterproof light from underwater toward the surface of the water, there is a certain angle at which no light is refracted above the water and all the light is reflected back.
 



 
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