Name
LESSON
Date
Outline
Electromagnetic Waves
Use your textbook to help you fill in the blanks.
What are electromagnetic waves?
1. Energy from the Sun reaches Earth by traveling through
empty space
.
2. A wave that can travel through matter or through empty
space is called a(n) electromagnetic wave.
electric
3. Magnetic fields and
fields are related.
4. The many different types of electromagnetic waves have
characteristic
energy.
wavelengths
, frequency, and amount of
5. The range of electromagnetic waves forms the
spectrum
electromagnetic
.
6. The electromagnetic waves in the electromagnetic spectrum
have different amounts of energy but all travel at the
speed of light
.
© McGraw-Hill Education
What are radio waves and infrared waves?
7. The waves of the electromagnetic spectrum with the
lowest frequencies and the least amount of energy
are
radio waves
.
8. The many uses of radio waves include radio, TV,
microwaves
, and Global Positioning Systems.
9. Infrared waves are emitted by every object because objects
are made up of
Unit 5 • Properties of Energy
Unit Resources
vibrating
atoms and molecules.
Use with Lesson 4
Electromagnetic Waves
5-47
LESSON
Outline
Name
Date
Why do we see colors?
10. Visible light is electromagnetic waves from the Sun that
white
comes to Earth as
prism
11. A(n)
that can bend light.
light.
is a triangular piece of glass or plastic
12. The light that is reflected by an object determines the
color
of that object.
What are ultraviolet rays and X-rays?
ultraviolet
13. The harmful
rays from the Sun cause
sunburns and can cause skin cancer.
absorbs
14. Earth’s upper atmosphere
harmful radiation from the Sun.
much of the
What are gamma rays?
15. Gamma rays have the shortest wavelengths, highest
frequencies, and greatest energy of all waves of the
electromagnetic spectrum.
preserve
16. The food industry uses gamma rays to
foods. Gamma rays kill bacteria, yeast, and insects.
Critical Thinking
I would draw the line between visible light and ultraviolet rays. Visible
light and electromagnetic waves with less energy than visible light
are not harmful. Ultraviolet rays can cause skin cancer. X-rays and
gamma rays are even more harmful.
5-48
Unit 5 • Properties of Energy
Unit Resources
Use with Lesson 4
Electromagnetic Waves
© McGraw-Hill Education
17. Where on the electromagnetic spectrum would you draw a
line that separates harmful electromagnetic waves from those
that are not harmful? Explain.