# 18.2 Worksheet - The EM Spectrum

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```					Chapter 18 The Electromagnetic Spectrum and Light                                    Name _____________________
Section 18.2 The Electromagnetic Spectrum                                            Period ____________
(pages 529–545)                                                                      Date _____________

This section identifies the waves in the electromagnetic spectrum and describes their uses.
1. Complete the table for the electromagnetic spectrum. List at least two uses for each kind of wave.
The Electromagnetic Spectrum
Type of Wave                          Use #1                                           Use # 2

The Waves of the Spectrum
2. Is the following sentence   true   or     false?   (circle one - If it is false change it to make it true).
William Herschel determined that the temperature of colors of light was higher at the blue end
and lower at the red end.

3. Herschel’s curiosity led him to conclude there must be invisible ________________________ beyond the red
end of the color band.

4. Is the following sentence   true   or     false?   (circle one - If it is false change it to make it true).
The full range of frequencies of electromagnetic radiation is called the electromagnetic spectrum.

5. Name each kind of wave in the electromagnetic spectrum, from the longest to shortest wavelength.

Radio Waves
6. Circle the letter of each way that radio waves might be used.
a. x-ray machines         b. microwave ovens     c. radio technology        d. television technology

7. Explain the difference between amplitude modulation (AM) and frequency modulation (FM)?

8. How do microwaves cook food?
Infrared Rays
9. Circle the letter of each way infrared rays are used.
a. source of light                         b. to discover areas of heat differences
c. source of heat                          d. to discover areas of depth differences
10. Thermograms show variations in ________________________ and are used to find places where a building
loses heat to the environment.

Visible Light
11. Each wavelength in the visible spectrum corresponds to a specific frequency and has a particular ___________.

12. Is the following sentence     true   or     false?   (circle one - If it is false change it to make it true).
One use for visible light is to help people communicate with one another.

Ultraviolet Rays
13. Ultraviolet radiation has applications in __________________________ and ________________________.

14. Is the following sentence     true   or     false?   (circle one - If it is false change it to make it true).
Ultraviolet radiation has a lower frequency that visible light.

X-rays
15. Is the following sentence     true   or     false?   (circle one - If it is false change it to make it true).
X-rays have higher frequencies than ultraviolet rays.
16. How can X-rays produce images of the inside of solid objects (like our bodies)?

Gamma Rays
17. Gamma rays have the highest _______________________ and therefore the most _____________________
and the greatest penetrating ability of all the electromagnetic waves.

18. How is gamma radiation used in medicine?

Critical Thinking
19. How is the Doppler effect used to detect the speed of a vehicle?

20. Write a paragraph about three different kinds of electromagnetic waves that you will encounter today. Describe
the wave in terms of its wavelength and frequency and in terms of how it is used.

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