Chapter 17 Practice Questions KEY
Long wavelength Medium
wavelength
Short wavelength
1.
Long wavelength Medium
wavelength
Short wavelength
Radio, Microwave Infrared, Visible,
Ultraviolet
X ray, gamma ray
1.
2. What two properties waves are used
to attach information to radio signals?
2. What two properties waves are used
to attach information to radio signals?
Frequency and amplitude
3. Give a specific example of how each
of the below EM waves might be used
Infrared Gamma Ray
3. Give a specific example of how each
of the below EM waves might be used
Infrared Gamma Ray
Night vision,
thermal imaging,
viper snakes finding
prey
Radiation therapy
for brain cancer,
explosions on the
sun
3. Give a specific example of how each
of the below EM waves might be used
Ultraviolet Microwave
3. Give a specific example of how each
of the below EM waves might be used
Ultraviolet Microwave
Insects seeing
flowers, sunlight,
sunburns, tanning
beds
Microwave oven,
Radar to detect
vehicles, cell
phones
3. Give a specific example of how each
of the below EM waves might be used
Radio
3. Give a specific example of how each
of the below EM waves might be used
Radio
Broadcast
television, Radio
Stations, Cell
Phones
4.What are two main sources of EM
waves on earth?
4.What are two main sources of EM
waves on earth?
The sun and human technology
5. Many different things can occur
when an EM wave encounters a
medium. List 2 of them
5. Many different things can occur
when an EM wave encounters a
medium. List 2 of them
Reflection, refraction, diffraction, absorption
6. What would happen to an EM wave that
never encountered matter?
6. What would happen to an EM wave that
never encountered matter?
It would continue to travel indefinitely
without losing energy
7. What is radiation?
7. What is radiation?
Energy that moves as an
electromagnetic wave
8.List each of the 7 EM waves in the
proper category
High frequency Medium
frequency
Low
frequency
8.List each of the 7 EM waves in the
proper category
HIgh frequency Medium
frequency
Low
frequency
X Ray, Gamma
Ray
Infrared, visible,
ultraviolet
Radio,
Microwave
9.List each of the 7 EM waves in the
proper category
Low energy Medium energy High energy
9.List each of the 7 EM waves in the
proper category
Low energy Medium energy High energy
Radio,
Microwave
Infrared,
Visible,
Ultraviolet
X Ray,
Gamma Ray
10. Why is UV light dangerous to humans
while infrared light is not?
10. Why is UV light dangerous to humans
while infrared light is not?
UV light has higher energy due to its
shorter wavelengths and high
frequency. The high energy can be
damaging to human cells
11. Label the various ways light can interact
with a medium.
11. Label the various ways light can interact
with a medium.
11. Label the various ways light can interact
with a medium.
11. Label the various ways light can interact
with a medium.
12. What is the difference between
translucent and opaque materials?
12. What is the difference between
translucent and opaque materials?
Translucent allows some light through but
opaque does not allow any light through
13. Higher energy EM waves penetrate
farthest into a dense medium. What colors
are more likely to penetrate to the bottom
of a lake?
13. Higher energy EM waves penetrate
farthest into a dense medium. What colors
are more likely to penetrate to the bottom
of a lake? Green, blue, indigo, and violet
14. The color of an object depends on
what two things?
14. The color of an object depends on
what two things?
The wavelengths that are available, the
wavelengths that are reflected or
absorbed
15. What colors of light can the human
eyeball detect?
15. What colors of light can the human
eyeball detect? Red, green, blue
16. A theater director wants to make the
backdrop onstage appear cyan. What
colors of light should they shine onto the
backdrop?
16. A theater director wants to make the
backdrop onstage appear cyan. What
colors of light should they shine onto the
backdrop? Blue Light and Green Light
17. What colors of pigment would be
mixed to create red ink?
17. What colors of pigment would be
mixed to create red ink? Yellow and
magenta
18. Someone tells you that wearing black
on a hot summer day will make you
warmer. What could be a possible
scientific explanation for this?
18. Someone tells you that wearing black
on a hot summer day will make you
warmer. What could be a possible
scientific explanation for this? Materials
that are black absorb all wavelengths of
light. That light energy is usually
transformed into thermal energy
19. Plants must absorb light in order to
produce the chemical energy they use to
survive. You have a plant in your house and
you want to help it grow. Which color of light
should you place your plant under if your
options are Red Light, Green Light, or Blue
Light?
19. Plants must absorb light in order to
produce the chemical energy they use to
survive. You have a plant in your house and
you want to help it grow. Which color of light
should you place your plant under if your
options are Red Light, Green Light, or Blue
Light? Red or Blue Light. Green Light would
likely kill the plant! It would not be able to
absorb any light
20. Explain how a prism works?
20. Explain how a prism works? Prisms use
refraction to spread out the different
wavelengths of light. Each wavelength bends
at a slightly different angle
21. How fast do EM waves travel in a vacuum
or outer space?
21. How fast do EM waves travel ?
In outer space/vacuum: a constant speed of
approximately 186,000 miles per second
On Earth: speed varies depending on what
medium the EM wave interacts with
22. What are 2 examples of radiation?
22. What are 2 examples of radiation?
Any of the 7 EM waves can be considered
radiation
23.
Reflection Bending of a wave as it encounters new
medium
Refraction Energy transferred to a medium
Absorption Waves spread out as some are reflected &
some are absorbed
Scattering Wave bounces off a medium
23.
Reflection Bending of a wave as it encounters new
medium
Refraction Energy transferred to a medium
Absorption Waves spread out as some are reflected &
some are absorbed
Scattering Wave bounces off a medium
24. Give an example of an object/material
that is…
a.Opaque: b.Translucent: c.Transparent:
24. Give an example of an object/material
that is…
a.Opaque: (example can be any material that lets no light through)
b.Translucent: (example can be any material that lets some light through)
c.Transparent: (example can be any material that lets all/most light through)
25 Which visible light color has…
a.The highest frequency –
b.The shortest wavelength -
c.The longest wavelength-
d.The lowest frequency-
25 Which visible light color has…
a.The highest frequency – Violet
b.The shortest wavelength - Violet
c.The longest wavelength- Red
d.The lowest frequency- Red
26. What are the primary colors of light?
26. What are the primary colors of light?
Red, Green, Blue
27. What are the primary colors of pigment?
27. What are the primary colors of pigment?
Cyan, Magenta, Yellow