Name Date Class

LESSON 2

Light

Directions: Use the clues and the terms listed below to complete the puzzle.

light ray light source opaque translucent transparent

Clues

Across

1. a narrow beam of light

3. describes a material that allows all light
to pass through and forms a clear
image

4. describes a material that does not allow
light to pass through it


Down

1. something that emits light

2. describes a material that allows light to
pass through but forms a blurry image

Sound and Light 27

Name Date Class

LESSON 2

Light

Directions: Complete this paragraph by choosing terms from the word bank and writing them in the correct
spaces.

electromagnetic emit gamma rays opaque

radio waves reflect translucent transparent

Visible light waves are part of the (1.) spectrum,
which ranges from low-frequency (2.) to high-frequency
(3.) . Some objects such as the Sun
(4.) lots of light. Most objects also
(5.) it. A material that allows light to pass through it and forms
a clear image is (6.) . A material that allows most light to pass
through but forms a blurry image is (7.) .

A material through which light does not pass through is (8.) .

Directions: Circle the term in parentheses that correctly completes each sentence.

9. Light travels much (faster/slower) than sound.

10. When light moves from air to water, it (speeds up/slows down).

11. When light waves interact with matter, they can be reflected, transmitted,
or (absorbed/intensified).

12. A light ray entering a piece of glass is (reflected/refracted).

Sound and Light 31

Name Date Class

LESSON 2

Light

Directions: Answer each question or respond to each statement on the lines provided.

1. Light can travel through outer space, but sound cannot. Why is that?

2. The production of light requires a source of . Give two
examples from the lesson that describe how light can be produced.

3. What causes our perception of different colors of light?

4. What does the law of reflection state?

5. What is refraction?

32 Sound and Light

Name Date Class

LESSON 2

Light

Directions: Use your textbook to complete each activity.

Electromagnetic Spectrum

Lowest-Frequency Waves Highest-Frequency Waves
visible light / infrared / ultraviolet / radio waves / gamma rays / X-rays / microwaves

1. The diagram of the electromagnetic spectrum above is out of order. Place the
electromagnetic waves in the correct order in the diagram below. Remember that the
lowest frequency waves are on the left and the highest frequency waves are on the right.

Electromagnetic Spectrum

Lowest-Frequency Waves Highest-Frequency Waves

2. Complete the table by listing examples of translucent, transparent, and opaque materials.

Translucent / Transparent / Opaque

Sound and Light 33

Name Date Class

LESSON 2

Light

Key Concept How do waves in the electromagnetic spectrum differ?

Directions: The diagram on the right shows the electromagnetic spectrum. Label the diagram by writing the
correct term on each line.

gamma rays

infrared light

microwaves

radio waves

ultraviolet light

visible light

X-rays


1.______

2.______

3.______

4.______

5.______

6.______

7.______

Directions: Answer each question on the lines provided.

8. As the frequencies of electromagnetic waves increase, what happens to their
wavelengths?

9. What unit is used to measure the wavelength of most electromagnetic waves?

10. What is the range of wavelengths of visible light?

Sound and Light 35

Name Date Class

LESSON 2

Light

Key Concept What happens to light waves when they interact with matter?

Directions: On the line before each object listed below, write E if it emits light, write R if it reflects light, and
write B if it both emits and reflects light.

1. Sun

2. Moon

3. lamp

4. cloud

5. mirror

6. firefly

7. lightning

8. TV set

Directions: On each line, write the term that correctly completes each sentence.

9. A lightbulb converts into light energy.

10. Unless a light ray comes into contact with a surface or enters a different material, it
travels in a .

36 Sound and Light

Name Date Class

LESSON 2

Light

Key Concept What happens to light waves when they interact with matter?

Directions: Draw a second arrow on each diagram to show what happens to the light ray.

Diagram 1 shows a light ray (arrow) striking a mirror. Diagram 2 shows a light ray that is
about to enter a thick piece of transparent glass.

Directions: Complete each item below.

3. In the reflection of light rays, the angle of equals the angle
of .

4. The passing of light rays through a material is called .

5. The perpendicular dotted line in each of the above diagrams is called the
.

6. In Diagram 2, the arrow you added shows the light ray being
.

7. Give an example of a material that interacts with light in each of the following ways:

a. transparent

b. translucent

c. opaque

Sound and Light 37