science chapter 17

Question 1

a wave that can travel through empty space and through matter

Answer 1

electromagnetic wave

Question 2

energy carried by an electromagnetic wave

Answer 2

radiant energy

Question 3

electromagnetic waves form when

Answer 3

a charge speeds up, slows down, or changes direction (charged particle vibrates)

Question 4

electric fields surround

Answer 4

the charged particles

Question 5

charged particles make

Answer 5

magnetic fields

Question 6

magnetic fields make

Answer 6

changing electric fields

Question 7

the connected magnetic and electric fields spread in all directions, creating

Answer 7

electromagnetic waves

Question 8

Electromagnetic waves are what kind of waves

Answer 8

transverse

Question 9

Electromagnetic waves travel through space at ________ km/s

Answer 9

300,000

Question 10

electromagnetic waves travel slower in

Answer 10

matter

Question 11

the sun emits energy by giving off

Answer 11

electromagnetic waves

Question 12

On the sun, electromagnetic waves are produced with many different wavelengths because

Answer 12

The sun has different areas with different temperatures

Question 13

Almost everything on earth emits

Answer 13

electromagnetic waves

Question 14

The higher the electromagnetic waves energy,

Answer 14

the higher the frequency

Question 15

Higher energy waves are

Answer 15

more dangerous for the skin

Question 16

The changing motion of an electric charge produces

Answer 16

each type of electromagnetic wave

Question 17

Every electromagnetic wave has a different _____, ______, and ________ _ ________ _____ __ _____.

Answer 17

frequency, wavelength, and carries a different amount of energy

Question 18

the entire range of electromagnetic waves with different frequencies and wavelengths.

Answer 18

electromagnetic spectrum

Question 19

The electromagnetic spectrum is organized based on…

Answer 19

wavelength and frequency

Question 20

the lowest frequency, lowest energy electromagnetic wave that has a wavelength longer than 30cm. Used for communication for sound and sometimes video.

Answer 20

Radio wave

Question 21

a low frequency, low energy, electromagnetic wave that is a little larger than a radio wave. Used for communication and satellite communications

Answer 21

microwave

Question 22

an electromagnetic wave that has a wavelength shorter than a microwave but longer than light. You feel these wave while warming your hands near a campfire or when using a television remote.

Answer 22

Infrared waves

Question 23

an electromagnetic wave that you can see in a rainbow of colors. Violet have the shortest wavelength and highest frequency.

Answer 23

light

Question 24

an electromagnetic wave that has a slightly shorter wavelength and higher frequency than light and carries enough energy to cause chemical reactions. Can damage or kill skin cells, causing sunburn and skin cancer

Answer 24

ultraviolet waves

Question 25

a high energy electromagnetic wave that has a slightly shorter wavelength and higher frequency than an ultraviolet wave. Used to scan your bones, but cannot hurt them due to calcium.

Answer 25

X-rays

Question 26

a higher energy electromagnetic wave with a shorter wavelength and higher frequency than all other types of electromagnetic waves. So high energy that they can be used to destroy cancerous cells. Formed in space

Answer 26

Gamma Rays

Question 27

the use of electromagnetic waves to send information in all directions

Answer 27

Broadcasting

Question 28

Explain how radio/TV stations broadcast information

Answer 28

They send out radio waves at a certain frequency, and the station converts the sounds and images to electric signals. Then the signals are sent to your tv using an carrier wave, and they are converted back to images and sound.

Question 29

an electromagnetic wave that a radio or television station uses to carry its sound or image signals

Answer 29

carrier wave

Question 30

the station matches the _______ ____ and _______ ______.

Answer 30

carrier wave and electric signal

Question 31

a change in the amplitude of a carrier wave

Answer 31

amplitude modulation (AM)

Question 32

a change in the frequency of a carrier wave

Answer 32

frequency modulation (FM)

Question 33

how a wave smoothly changes from high to low

Answer 33

analog

Question 34

produces and sends out radio waves

Answer 34

transmitter

Question 35

receives and changes the waves back into sound

Answer 35

antenna

Question 36

waves that can carry more energy than radio waves, due to their shorter wavelength

Answer 36

microwaves

Question 37

pass signals from your phone until it reaches the phone you call or text

Answer 37

cell towers

Question 38

a worldwide navigation system that uses satellite signals to determine a receiver's location

Answer 38

Global Positioning System (GPS)

Question 39

vibrating molecules in any matter emit

Answer 39

infrared waves

Question 40

the wavelength of infrared objects depends on the objects

Answer 40

temperature

Question 41

The hotter the infrared object, the ___________ and ___________ produced.

Answer 41

greater frequency and shorter wavelength

Question 42

Thermal cameras use what kind of wave to detect thermal energy loss?

Answer 42

infrared waves

Question 43

Under certain lights, objects glow with this wave

Answer 43

ultraviolet

Question 44

Medical ultraviolet waves are strong enough to

Answer 44

cure skin problems

Question 45

the chemicals inside ultraviolet lights can power

Answer 45

lightbulbs

Question 46

X Rays are used for

Answer 46

security and bone scans

Question 47

Gamma rays are medically used for

Answer 47

destroying harmful tissue in paitents