chapter 9: electromagnetic spectrum

Question 1

Radio waves and x-rays have the

Answer 1

same speed

Question 2

Which of the following has the highest frequency?

Answer 2

gamma rays

Question 3

Which of the following has the lowest frequency?

Answer 3

AM radio

Question 4

If you double the absolute temperature of an object, the wavelength of the emitted light is

Answer 4

gets shorter by a factor of 2

Question 5

What kind of light has the longest wavelength?

Answer 5

infrared light

Question 6

Invisible light includes

Answer 6

x-rays, UV and IR

Question 7

As an object gets hotter and hotter, the color of its glow will change from

Answer 7

red, to yellow, to white, to blue

Question 8

If you double the absolute temperature, the total radiation

Answer 8

increases by 16

Question 9

Most of the energy of an ordinary tungsten-filament lightbulb is emitted in the color

Answer 9

infrared

Question 10

Heat radiation is also called

Answer 10

IR

Question 11

A tungsten lightbulb has 100 watts printed on it. About how much power is actually emitted as visible light?

Answer 11

16 watts

Question 12

Which color star would be the hottest?

Answer 12

blue

Question 13

Sunlight is the brightest in which color?

Answer 13

green

Question 14

Which of the following exposes a person to the kind of radiation that can cause cancer?

Answer 14

CAT scan

Question 15

Because of their warmth, humans emit primarily

Answer 15

IR

Question 16

If you sleep under a tree, you won’t get wet from morning dew. That’s because the tree

Answer 16

emits IR

Question 17

Dew forms when the ground cools

Answer 17

by emitting IR

Question 18

A “heat-seeking” missile actually aims itself toward

Answer 18

infrared light

Question 19

The ozone layer is created by and absorbs:

Answer 19

UV radiation

Question 20

Ozone depletion is caused by

Answer 20

CFCs

Question 21

A few years ago a certain kind of spray was banned. These were the cans that used

Answer 21

CFCs

Question 22

Multispectral refers to

Answer 22

the many colors in visible light

Question 23

The name NMR has been changed to

Answer 23

MRI

Question 24

Which of the following statements about the ozone layer is not true?

Answer 24

Ozone is the most important greenhouse gas

Question 25

The clouds in thunderstorms rise until they reach

Answer 25

the ozone layer

Question 26

The original name for the microwave oven was

Answer 26

radar range

Question 27

Microwave ovens use radiation with a wavelength

Answer 27

same as radar

Question 28

The microwaves in a microwave oven mostly heat

Answer 28

water

Question 29

MRI maps the distribution of which element to produce an image

Answer 29

hydrogen

Question 30

UV light (choose all that are correct)

Answer 30

is responsible for sunburns and windburns, is used to kill bacteria in the water of remote villages in India, is also called black light, and is also called heat radiation.

Question 31

Which of the following is best for seeing the calcium in bones?

Answer 31

x-ray

Question 32

A black light is designed to emit

Answer 32

UV

Question 33

A positron is

Answer 33

an antielectron

Question 34

Sunburn is usually caused by

Answer 34

UV radiation

Question 35

Which of the following uses antimatter?

Answer 35

PET scan

Question 36

To image the hydrogen in the body, use

Answer 36

MRI

Question 37

Which is the cause for "windburn"?

Answer 37

solar UV

Question 38

Remote control of a TV is usually done using

Answer 38

IR

Question 39

Pit vipers and mosquitoes can sense

Answer 39

IR

Question 40

Infrared radiation can (choose all that apply)

Answer 40

help snakes locate prey

Question 41

Cancer is most likely to be caused by

Answer 41

UV radiation

Question 42

The advertising slogan "whiter than white" means that the material

Answer 42

emits visible light

Question 43

To make clothes appear extra clean, manufacturers apply

Answer 43

fluorescent dyes

Question 44

Which of the following is a typical energy for an x-ray?

Answer 44

50,000 eV

Question 45

In total darkness, you can see people if you have a camera that is sensitive to

Answer 45

infrared radiation

Question 46

Cell phones emit

Answer 46

microwaves

Question 47

Each of these make use of infrared radiation except

Answer 47

measurement of wave velocities in the ocean

Question 48

Bats navigate in caves by using

Answer 48

ultrasound

Question 49

The phosphor of a fluorescent lightbulb turns which if these into visible light?

Answer 49

UV light

Question 50

"Cool roofs"

Answer 50

must reflect infrared

Question 51

The best kind of radiation to purify water is

Answer 51

UV

Question 52

Which of the following are electromagnetic waves? Choose all that are appropriate

Answer 52

radar, visible light, UV, x-rays

Question 53

To image hydrogen in the brain, the best technique is

Answer 53

MRI

Question 54

Which of the following is an advanced method that uses x-rays?

Answer 54

CAT