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