Chapter 11: Electromagnetic Waves

Question 1

made by vibrating electric charges; composed of changing electric field and magnetic fields

Answer 1

electromagnetic waves

Question 2

a massless bundle of energy that behaves like a particle

Answer 2

photon

Question 3

electromagnetic waves with wavelengths longer than 10cm

Answer 3

radio waves

Question 4

electromagnetic waves with wavelengths between 0.1 mm and 30 cm

Answer 4

microwaves

Question 5

electromagnetic waves with wavelengths between about one-thousandth of a meter and about 700-billionths of a meter

Answer 5

infrared waves

Question 6

the range of electromagnetic waves that you detect with your eyes

Answer 6

visible light

Question 7

electromagnetic waves with wavelengths from about 400-billionths to 10-billionths of a meter

Answer 7

ultraviolet waves

Question 8

electromagnetic waves with wavelengths between about ten-billionths of a meter and ten-trillionths of a meter

Answer 8

x-rays

Question 9

electromagnetic waves with wavelengths shorter than about 100-trillionths of a meter

Answer 9

gamma rays

Question 10

an electromagnetic wave with the specific frequency that a station is assigned

Answer 10

carrier wave

Question 11

the process of adding the signal wave to the carrier wave

Answer 11

modulation

Question 12

electric signals whose values change smoothly over time

Answer 12

analog signals

Question 13

electric signals where there are only two possible values: ON and OFF

Answer 13

digital signals

Question 14

transmits one radio signal and receives another radio signal

Answer 14

transceiver

Question 15

a system of satellites, ground monitoring stations, and receivers that determine your exact location at or above Earth’s surface

Answer 15

Global Positioning System (GPS)

Question 16

vibrating electric charges produce

Answer 16

electromagnetic waves

Question 17

electromagnetic waves carry what type of energy

Answer 17

radiant

Question 18

in empty space, electromagnetic waves travel at…

Answer 18

300,000 km/s — speed of light

Question 19

electromagnetic waves travel more slowly in ______, with a speed that _______________.

Answer 19

matter; depends on the material

Question 20

electromagnetic waves can behave as particles called

Answer 20

photons

Question 21

divided into several sections, each with a certain range of frequencies and specific properties

Answer 21

electromagnetic spectrum

Question 22

what two kinds of waves in the electromagnetic spectrum have the longest waves

Answer 22

radio waves and microwaves

Question 23

all objects emit…

Answer 23

infrared waves

Question 24

out of all of the waves on the electromagnetic spectrum, the human eye can only detect…

Answer 24

visible light

Question 25

what three kinds of waves on the electromagnetic spectrum are both helpful and harmful to humans?

Answer 25

ultraviolet waves, x-rays, and gamma rays

Question 26

radio waves and microwaves can be used to…

Answer 26

transmit signals and information

Question 27

radio stations transmit _______ that receivers convert to _____.

Answer 27

radio waves; sound waves

Question 28

what contains transceivers and converts sound waves into electric signals and electric signals into sound waves?

Answer 28

telephone

Question 29

microwave towers and satellites are used to transmit…

Answer 29

telephone signals