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QUARTER 2 Flashcards

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1
Q

What is an electromagnetic wave?

A

Are disturbances that transfer through field. A combination of electric and magnetic fields that oscilate perpendicular to each other and to the direction of the wave

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2
Q

TRUE OR FALSE

Electromagnetic waves are transverse waves.

A

TRUE

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3
Q

TRUE OR FALSE

EM waves requires a medium for transmission.

A

FALSE

EM waves does not require a medium for transmission

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4
Q

TRUE OR FALSE

EM waves travels with the same speed in the absence of matter (vacuum), and this speed is absolute.

A

TRUE

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5
Q

EM waves travel at what speed?

A

Travel at a constant speed of 300,000,000 m/s (speed of light)

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6
Q

EM waves are produced by?

A

Accelerating electrons

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7
Q

He demonstrated the magnetic effect based on the direction of current.

A

Andre Marie Ampere

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8
Q

He formulated the principle behind electromagnetic induction.

A

Michael Faraday

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9
Q

He showed experimental evidence of electromagnetic waves and their link to light.

A

Heinrich Rudolf Hertz

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10
Q

He contributed in developing equations showing the relationships of electricty and magnetism.

A

James Clark Maxwell

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11
Q

He showed how a current carrying wires behaves like a magnet.

A

Hans Christian Oersted

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12
Q

What is electromagnetic induction?

A

Production of an electromotive force across an electric conductor in a changing magnetic field

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13
Q

These are waves in which the displacement of the medium is in the same direction as, or opposite direction to, the direction of propagation of the wave.

A

Longitudinal Wave

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14
Q

A moving wave whose oscillations are perpendicular to the direction of the wave or path of propagation.

A

Transverse Wave

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15
Q

TRUE OR FALSE

There is an inverse relationship between frequency and wavelength of EM waves.

A

TRUE

The LONGER the wavelength, the LOWER the frequency.
The SHORTER the wavelength, the HIGHER the frequency.

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16
Q

EM waves can be described by their?

A

Wavelengths, energy, and frequency

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17
Q

It is the distance between wave crests.

A

Wavelength of an EM Wave

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18
Q

The distance between wave crests is measured in terms of?

A

Micrometer or micron

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19
Q

Particles of lights are called?

A

Photons

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20
Q

The amount of energy in the wave increases as wavelengths get?

A

Smaller

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21
Q

It is the collection of photons.

A

Radiation

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22
Q

What is the frequency of radio waves with the wavelength of 20m?

A

f= c divided by m
f= 3x10^8 m/s divided by 20
f=1.5x10^7 Hz

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23
Q

Half the height from the peak of a crest to the lowest point of a wave.

A

Amplitude

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24
Q

Number of cycles a wave completed in one second.

A

Frequency

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25
Unit used to measure the frequency of waves.
Hertz
26
This EM wave has the lowest frequency.
Radio Waves
27
This EM wave has the shortest wavelength.
Gamma Rays
28
The full range of wave frequencies that characterizes solar radiation.
Electromagnetic Spectrum
29
One micrometer is equal to?
One-millionth of a meter or 1/100 the diameter of a human hair
30
Splitting of white light into its constituent colors.
Dispersion of Light
31
Shortest to Longest Wavelength
``` Gamma Rays X-rays Ultraviolet Visible Light Infrared Microwaves Radio Waves ```
32
Increasing Frequencies of EM Waves
``` Radio Waves Microwaves Infared Visible Light Ultraviolet X-Rays Gamma Rays ```
33
Decreasing Energies of EM Waves
``` Gamma Rays X-rays Ultraviolet Visible Light Infrared Microwaves Radio Waves ```
34
It sends Radio waves to the receiver.
Transmitter
35
An antenna and circuit board inside the toy receives signals from the transmitter and activates motors inside the toy.
Receiver
36
Turns the front wheel left/right.
Motor/s
37
It refers to the batteries.
Power Source
38
It has capacitors, resistors, and diodes.
Circuit Board
39
Example of materials that allows passage of Radio waves.
Glass, paper, rubber, cotton, plastic cover, wax paper
40
Example of materials that blocks the passage of Radio waves.
Gold, copper, aluminum
41
These are produced by making electrons vibrate in an antenna and used to transmit sound and picture info over long distances.
Radio Waves
42
What is the range of Radio Waves?
80 km
43
What is used to extend the range of Radio Waves?
Repeater
44
Give the characteristics of Radio Waves.
Not line of sight Can pass through walls Longer range Not light sensitive
45
Disadvantages of Radio Waves.
It is easier to eavesdrop. More costly than infrared. Communication devices that make use of the same frequencies interfere with each other.
46
Maximum amount of displacement of a particle of the medium.
Amplitude
47
Is the interface between radio waves propagating through space.
Antenna
48
Object that has been intentionally placed into orbit.
Satellite
49
The whole region of the radio waves is divided into smaller regions called?
Wavebands
50
This type of wave is used for broadcasting by local radio stations.
Medium and High frequency waves
51
Radio and TV Broadcasting with the shortest wavelength range.
Very High frequency
52
TRUE OR FALSE Microwaves have bigger wavelengths than radio waves.
FALSE Microwaves have smaller wavelengths than radio waves
53
This type of EM Wave can penetrate the atmosphere of the earth.
Microwave
54
This type of EM Wave is used in satellite communications.
Microwave
55
These are transmitted by an antenna to a satellite
Microwave Signals
56
What is a RADAR?
It is an acronym of radio detection and ranging
57
It is a radio transmitter and receiver that uses microwaves. It depend on overlapping network cells or areas of land several kilometers in diameter.
Cellphone
58
What are the applications of Microwaves?
Satellite communications Radars Tv transmission Microwave Oven
59
How does a microwave cooks?
A part of oven produces microwaves. Microwaves are sent to the reflecting pan. It is reflected by the fan. As microwaves pass through food, they transfer energy to the water molecules in the form of heat.
60
This color has the longest wavelength.
Red
61
This EM Wave lies beyond the red end of the visible light. It is emitted by all objects.
Infrared radiation
62
Useful Applications of Infrared Radiation.
Infrared photographs taken from a satellite with special films provide useful details of the vegetation on the Earth's surface. Infrared scanners show temperature varation of the body. Infrared remote controls are used in TVs, video cassete recorders, etc. Infrared telescopes are used for seeing in the dark. Autofocus camera has a transmitter that sends out infrared pulses.
63
Advantages of Infrared in Wireless Communication.
Low power requirement Low circuit costs Simple circuitry Higher security
64
Infrared can be used in?
``` Augmentative communication devices Car locking system Computers Printers Emergency response systems Headphones Home security systems Navigation Signages Telephones ```
65
Disadvantages of Inrared.
``` Transmitters and receivers should be directly aligned Can be blocked by common materials Distance Sensitive Weather Sensitive Can be affected by light ```
66
Spectrum of white light.
Visible Spectrum
67
Device used to separate white ligh to its components.
Prism
68
Infared was discover by?
Sir Frederick William Herschel year 1800
69
TRUE OR FALSE Blue and Green means cold temperature and Red and Yellow means hot/warm temperature.
TRUE

SCIENCE (2 decks)

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