1. William Herschel measured the temperature of different __________ of light.
The temperature was lowest at the _______ end and highest at the ________ end.
Curiosity led him to discover evidence of radiation ________ the band of ___________ light
colors
blue
red
past
visible

2. The Waves of the Spectrum
What waves are included in the electromagnetic spectrum?
How is each type of electromagnetic wave used?

3. The Waves of the Spectrum
The electromagnetic spectrum includes __________ waves, _____________ rays, ____________ light, _________________ rays, ____________, and _____________ rays.
radio
infrared
visible
ultraviolet
X-rays
gamma
Electromagnetic
Spectrum Song

4. The Waves of the Spectrum
Visible light is the only part of the electromagnetic spectrum that you can ________, but it is just a small part.
Each kind of wave
is characterized
by a range of
_____________
and _________
_________.
see
frequencies
wave-
lengths

5. Radio Waves
Radio waves are used in ____________ and _______________ technologies, as well as in ______________ ovens and __________.
They have the ______________ wavelength and ____________ frequency of all the waves in the electromagnetic spectrum.
radio
television
microwave
radar
longest
lowest

6. Radio Waves
The announcer’s voice and the music on CD leave the radio studio as electronic signals. Those signals are used to produce a wave with either a varying amplitude or a varying frequency.
______ waves have a varying amplitude.
______ waves have a varying frequency. AM FM
Amplitude modulation
Frequency modulation

7. Radio Waves Microwaves
The shortest-wavelength radio waves are called ________________. Microwave wavelengths are from about 1 m to about 1 mm.
Microwaves cook and ___________ food. Microwaves also carry ____________ conversations. The process works much like a radio broadcast.
microwaves
reheat
cell phone

8. The word radar is an acronym for __dio ___etection and __anging.
Radio Waves
Radar
The word radar is an acronym for __dio ___etection and __anging.
The waves ___________
off the objects they
encounter and bounce
back toward where they
came from. ra d r
reflect

9. Infrared Rays
Infrared rays are used as a source of ____________ and to discover areas of heat differences.
Infrared rays have ____________ wavelengths than radio waves and ___________ frequencies.
Warmer objects give off _________ infrared radiation than cooler objects.
heat
shorter
greater
more

10. A device called a thermograph
Infrared Rays
A device called a thermograph
uses infrared sensors to create ________________, color-coded
pictures that show variations in
temperature.
Search-and-rescue teams use infrared cameras to locate ____________ who are trapped during disasters.
thermograms
people

11. Infrared Rays
A thermogram can be used to diagnose _____________ in a utility line.
The colors in the thermogram image show that the electric current in the _____________ wire is not flowing as it should.
problems
middle

12. Visible Light
People use visible light to __________, to help keep them ________, and to __________________ with one another.
see
safe
communicate

13. Each color of light corresponds to a different range of _____________.
Visible Light
Each color of light corresponds to a different range of _____________.
In order of decreasing wavelength, the colors
spell out…
wavelengths
ROYGBIV

14. Ultraviolet Rays
Ultraviolet rays have applications in ____________ and ________________, and in _____________________.
These rays have ___________ wavelengths than visible light and ______________ frequencies.
medicine
health
agriculture
shorter
higher

15. Ultraviolet Rays
Some exposure to ultraviolet rays helps your skin produce vitamin ______, which helps the body absorb calcium from foods.
Excessive exposure can cause sunburn, wrinkles, skin ____________, and eye damage.
Ultraviolet rays are used to kill __________________.
In winter, plant nurseries use ultraviolet lights to help plants __________. D
cancer
microorganisms
grow

16. X-Rays
X-rays are used in ____________, ____________, and transportation to make ___________ of the inside of solid objects.
X-rays have very ________ wavelengths, ________ frequencies, and high _____________ that can penetrate matter that light cannot.
Too much exposure to X-rays can _________ or damage living ____________.
medicine
industry
pictures
short
high
energy
kill
tissue

17. X-Rays
Airport security screeners use X-rays to search baggage for potentially dangerous objects.

18. Gamma Rays
Gamma rays are used in the medical field to __________ ________ cells and make pictures of the ___________, and in industrial situations as an inspection tool.
kill
cancer
brain

19. Gamma Rays
Gamma rays have the __________ wavelengths in the electromagnetic spectrum .
They have the _____________ frequencies, the most energy, and the greatest penetrating ability of all the electromagnetic waves.
Exposure to tiny amounts of gamma rays is _____________, but overexposure can be deadly.
shortest
highest
tolerable

20. Gamma Rays
Gamma rays emitted by radioactive tracers in the brain are used to produce color-coded images. Areas of high activity show up in red.

21. Which waves have the longest wavelength?
Assessment Questions
Which waves have the longest wavelength?
radio waves
infrared rays
visible light
ultraviolet rays

22. Assessment Questions
What type of electromagnetic radiation is used to keep prepared foods warm in a serving area?
ultraviolet rays
infrared rays
X-rays
gamma rays

23. Assessment Questions
3. Visible light makes up a very large section of the electromagnetic spectrum.
True or False
False

24. 4. What waves have the highest frequency and most energy?
Assessment Questions
4. What waves have the highest frequency and most energy?
ultraviolet rays
infrared rays
X-rays
gamma rays