C14 Terms

Question 1

A type of wave that does not require a medium.

Answer 1

electromagnetic (EM) spectrum

Question 2

299,792,458 m/s

Answer 2

speed of light (c)

Question 3

The bundle that light travels in.

Answer 3

photon

Question 4

Waves that carry both radio and television signals

Answer 4

radiowave

Question 5

Span the upper end of the EM spectrum.

Answer 5

microwave

Question 6

Just below the red end of visible light.

Answer 6

infared (IR)

Question 7

A distinct subregion of IR energy.

Answer 7

terahertz band

Question 8

Includes all the EM energy humans can detect.

Answer 8

visible light

Question 9

Just beyond visible violet.

Answer 9

ultraviolet light

Question 10

Are extremely short.

Answer 10

x-ray

Question 11

Their wave lengths are the smallest know.

Answer 11

gamma ray

Question 12

X-ray technologies that produce images.

Answer 12

computed axial tomography (CAT or CT) scan

Question 13

Radio detection and ranging

Answer 13

radar

Question 14

A moving image on a screen

Answer 14

television

Question 15

Used by highway systems

Answer 15

radio-frequency identification (RFID)

Question 16

Any method of navigation that uses the radio frequency portion of the EM spectrum

Answer 16

radio navigation

Question 17

Observing stars with radios

Answer 17

radio astronomy

Question 18

Why can an EM wave be transmitted without matter?

Answer 18

It is an EM wave

Question 19

When we use the speed of light as the constant C what condition are we assuming? What is its value under this condition?

Answer 19

That it is in a vacuum. 299,792,458 m/s

Question 20

How is EM energy like a wave? Like a particle?

Answer 20

It shows interference, it refracts and diffracts. It moves in strait lines has momentum.

Question 21

The energy of a photon is proportional to which property?

Answer 21

The theory of relativity.

Question 22

What phenomenon has been observed only in EM waves?

Answer 22

They do not have to have a medium.

Question 23

Why is EM energy also called radiant energy?

Answer 23

They travel as rays.

Question 24

How do radio waves form?

Answer 24

When electrons are accelerated.

Question 25

What defines the upper limit for the IR band?

Answer 25

Visible light. Produced mostly by the thermal vibrations of atoms and molecules.

Question 26

What is the range of frequencies for visible light in terahertz?

Answer 26

From 384 THz to 789 THz

Question 27

How is UV light produced?

Answer 27

Emitted by the electrons of atoms when they lose energy.

Question 28

How are x rays produced?

Answer 28

When high speed electrons strike an atom and slow down rapidly.

Question 29

How are gamma rays formed?

Answer 29

Produced by changes in atomic nuclei.

Question 30

What device is essential to form and receive radio waves?

Answer 30

A radio

Question 31

How is radar similar to active sonar?

Answer 31

It sends out signals and look for ecos

Question 32

What two characteristics of the human visual system does television use to create the illusion of moving images?

Answer 32

Recognizing dots as images and of lots p pictures as a moving image

Question 33

What are the advantages and disadvantages of using RFID chips for personal identification?

Answer 33

Advantages- easly find out who someone is

Disadvantages- invation of privacy

Question 34

What device is essential to form and receive radio waves?

Answer 34

A radio

Question 35

How is radar similar to active sonar?

Answer 35

It sends out signals and look for ecos

Question 36

What two characteristics of the human visual system does television use to create the illusion of moving images?

Answer 36

Recognizing dots as images and of lots p pictures as a moving image

Question 37

What are the advantages and disadvantages of using RFID chips for personal identification?

Answer 37

Advantages- easly find out who someone is

Disadvantages- invation of privacy