2nd Peridocial Exam Reviewer (EM WAVES)

Question 1

What is the correct flow for radio communication and broadcasting?

Answer 1

Microphone, Modulator, Antenna, Demodulator, Amplifier, Speaker

Question 2

Does tuner produces radio frequency carrier waves?

Answer 2

No

Question 3

How does UV Light exhibit its germicidal effect?

Answer 3

UV LIGHT disrupts the reproductive abilities of bacteria and viruses.

Question 4

How does the wavelength of infrared differ from the wavelength of ultraviolet rays?

Answer 4

Longer

Question 5

Why are grammars rays more dangerous to human than visible light?

Answer 5

Gamma rays have greater energy than visible light for penetrating matter.

Question 6

EM Waves order from shortest to longest wavelength

Answer 6

Gamma rays, X-Rays, UV Rays, Visible Light, Infrared, Microwaves, Radio

Question 7

How can X-radiation be harmful and how it can be a useful diagnostic tool?

Answer 7

Overexposure to X-Rays can cause cancer, though in limited doses X-rays can be used for imaging internal body parts.

Question 8

The speed of an EM Waves is equal to

Answer 8

Wavelength times frequency

Question 9

An EM WAVES with a frequency higher than that of a gamma rays.

Answer 9

A Z-ray would have a shorter wavelength than gamma ray.

Question 10

The fact that you can get sunburned while submerged in water is evidence that water is ____________.

Answer 10

Transmits ultraviolet light.

Question 11

EM WAVES used for RADAR

Answer 11

Radio

Question 12

Waves lie at the ends of the visible spectrum

Answer 12

Infrared and Ultraviolet Rays

Question 13

Waves that are created as a result of vibrations between an electric and magnetic field?

Answer 13

Electromagnetic waves

Question 14

Which property spells the difference between infrared and ultraviolet radiation?

Answer 14

Wavelength

Question 15

In a vacuum, all EM WAVES have the same ________.

Answer 15

Speed

Question 16

Which WAVES that tans our skin?

Answer 16

Ultraviolet

Question 17

EM WAVES used to cook food, predict the weather and for communications?

Answer 17

Microwaves

Question 18

Gamma rays have the highest frequencies and radio waves have the lowest frequencies. what does this statement imply?

Answer 18

Gamma rays have the most energy and radio waves have very little energy.

Question 19

In a vacuum, EM RADIATION of short wavelengths ____________.

Answer 19

Travels as fast as radiation of long wavelengths

Question 20

Which wavelength of the EMR can penetrate human tissue?

Answer 20

Gamma

Question 21

CLASSIFY

A father watching NBS via satellite

Answer 21

Microwaves

Question 22

CLASSIFY

Camera autofocusing

Answer 22

Infrared

Question 23

CLASSIFY

Using remote controls

Answer 23

Infrared

Question 24

CLASSIFY

Treating cancer

Answer 24

Gamma

Question 25

*CLASSIFY* Using red emergency light on cars

Answer 25

Visible Light

Question 26

*CLASSIFY* Checking of bank signature

Answer 26

UV Light

Question 27

*CLASSIFY* Sterilization of water in drinking fountains

Answer 27

UV Light

Question 28

*CLASSIFY* Diagnosis of bone structure

Answer 28

X-ray

Question 29

*CLASSIFY* Using optic fibers in wiring

Answer 29

Visible Light

Question 30

*CLASSIFY* A policeman officer uses RADAR for Speed Control

Answer 30

Radio

Question 31

*CLASSIFY* Used to inspect welded joints in industry

Answer 31

X-ray

Question 32

*CLASSIFY* A dentist obtaining an image of the root of a tooth

Answer 32

X-ray

Question 33

*CLASSIFY* Cooking food

Answer 33

Microwaves

Question 34

*CLASSIFY* Used in phototherapy

Answer 34

Visible Light

Question 35

*CLASSIFY* Help to produce Vitamin D

Answer 35

UV Light

Question 36

They are smaller wavelength than radio waves.

Answer 36

Microwaves

Question 37

Also called as HEAT RAYS

Answer 37

Infrared

Question 38

When white light passes through prism, it is separate into constituent colors: ROYGBIV

Answer 38

Visible Light

Question 39

Sun is the main source of ___________.

Answer 39

UV Radiation

Question 40

Who discovered X-ray?

Answer 40

Wilhelm Conrad Roentgen

Question 41

Type of X-ray that uses to help doctors look inside the body

Answer 41

Long-wavelength X-ray

Question 42

They are shortest wavelength and highest frequency.

Answer 42

Gamma Rays

Question 43

They are used in treating cancer called _______.

Answer 43

Radiotherapy

Question 44

*CLASSIFY* Used for sterilization of drinking water

Answer 44

Gamma Rays

Question 45

EM Waves have an electric magnetic field that travels _________ with the magnetic field.

Answer 45

Perpendicular

Question 46

EM WAVES order from lowest frequency to highest frequency.

Answer 46

Radio,Microwaves, Infrared, Visible Light, UV Light, X-ray, Gamma Ray

Question 47

Em WAVES order from lowest energy to highest energy.

Answer 47

Radio,Microwaves, Infrared, Visible Light, UV Light, X-ray, Gamma Ray

Question 48

Lowest frequency, lowest energy and longest wavelength

Answer 48

Radio waves

Question 49

Converts sound wave to audio-frequency signal

Answer 49

Microphone

Question 50

Extract AF SIGNALS from modulated carrier wave

Answer 50

Demodulator