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periodical test 2 > science > Flashcards

science Flashcards

1
Q

a region of space around an electrically charged particle or object in which an electric charge would feel force

A

electric field

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2
Q

The interplay of changing electric and magnetic field leads to the production of

A

electromagnetic waves

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3
Q

is produced by accelerating charged particles or particles oscillating about an equilibrium position, with the electric field and magnetic field vibrating perpendicularly to each other and to the direction of wave propagation.

A

electromagnetic wave

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4
Q

A Scottish physicist that predicted the existence of electromagnetic waves in 1862.

A

james clerk maxwell

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5
Q

In 1887, through the efforts of German physicist Heinrich Hertz, waves were observed to exist.

A

heinrich hertz

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6
Q

what is the unit of speed?

A

m/s

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7
Q

what is the unit of frequency?

A

f

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8
Q

what is the unit of wavelength?

A

meters

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9
Q

what is the speed of a vacuum?

A

3 x 10^8 m/s.

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10
Q

the speed of a vacuum is represented by what letter?

A

c

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11
Q

is the continuous range of EM waves arranged in order of frequency or wavelength.

A

electromagnetic spectrum

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12
Q

are formed when an electric field comes in contact with a magnetic field.

A

electromagnetic waves

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13
Q

The electric field and magnetic field of an EM wave are perpendicular to each other and to the direction of motion of the wave.

A

true

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14
Q

are the longest of all magnetic waves, ranging from 10-1 to 104.

A

radio waves

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15
Q

the oldest of all magnetic waves

A

radio waves

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16
Q

The frequency of ??? ranges from 3.0 x 104 to 3.0 x 1012 Hz or from 300 to 3000 MHz.

A

radio waves

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17
Q

This frequency is divided into specific bands for wireless communication.

A

radio waves

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18
Q

Low frequency, 30-300 khz

A

long distance communication navigation

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19
Q

medium frequency, 300-3000 khz

A

Amplitude moderation (AM) radio broadcasting

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20
Q

High frequency, 3-30 Mhz

A

Public transportation, electronic payment systems

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21
Q

very high frequency, 30-300 Mhz

A

frequency modulation (FM) radio broadcasting

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22
Q

ultra-high frequency, 300-3000 Mhz

A

police radio communications, modern cellphones

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23
Q

It makes use of radio waves for the detection of objects, weather forecasting, military surveillance and tracking satellites

A

radar

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24
Q

what are the uses of radio waves in technologies?

A

Automatic doors, Wi-Fi, bluetooth and GPS

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25
Q

what is the uses of radio waves in medical application?

A

Magnetic Resonance Imaging (MRI)
Reducing cellulite on the body and wrinkles and fine lines on the face
Tightening sagging or loose skin

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26
Q

Extraterrestrial Sources of Radio Waves

A

JUPITER AND SUN

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27
Q

They are generated by alternating current circuit attached to an antenna. It is also generated by electronic devices such as LC oscillators,which are electrical circuits.”

A

radio waves

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28
Q

lies somewhere between 3 x 108 Hz and 3 x 1011 Hz, which is from 300 MHz to 300 GHz, with a wavelength ranging from 10-3 to 10-1 m.

A

microwaves

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29
Q

is credited for discovering microwaves in 1864

A

james clerk maxwell

30
Q

what is the use of microwaves in communication?

A

Sending signals for cable television, as well as video or audio feeds from production vans to broadcasting stations
Long distance telephone calls

31
Q

what are the other uses of microwaves?

A

Remote sensing for disaster management and mapping

Weather forecasting

32
Q

what are the uses of microwaves in medical applications?

A

Uses the heat of microwaves to shrink or destroy tumors

Used to assess and monitor progress of treatment of breast cancer

33
Q

infrared literally means what?

A

below red

34
Q

It has a lower frequency than the red part of the visible light.

A

infrared waves

35
Q

ranges from 3 x 10^11 to 4 x 10^14 Hz, with a wavelength ranging from 7.5 x 10^-7 to 10^-3 m.

A

infrared waves

36
Q

a British astronomer, discovered IR in 1800.

A

Sir william herschel

37
Q

cannot be seen by the naked eye but it can be felt as heat.”

A

infrared radiation

38
Q

what are the uses of infrared waves?

A

Used in remote controls of television sets, burglar alarm systems, night vision cameras and certain types of thermometers
Most computers, laptops, and printers are equipped with infrared data association ports that enable you to transfer and print data without connecting them to a cable

39
Q

what are the uses of infrared waves in medical applications?

A

Physio-
therapists use heat lamps to heal sports injuries
Medical infrared imaging is used for diagnosis and prognosis in areas such as oncology, rheumatology, sports medicine and orthopedics.

40
Q

EM radiations in the range of 4 x 10^14 to 8 x 10^14 Hz with corresponding wavelengths of 4 x 10^-7 to 8 x 10^-7 m are the only ones seen by the naked eye. This part of the EM spectrum is called

A

visible light

41
Q

what object did isaac newton used when he discovered the visible light?

A

prism

42
Q

discovered the range of wavelength in the visible light spectrum when he refracted white light with a prism.

A

isaac newton

43
Q

what is the wavelength of red?

A

760 nm

44
Q

what does nm mean?

A

nenometers

45
Q

what is the wavelentgh of orsnge

A

610 nm

46
Q

what are the uses of visible light?

A

Every device that has a viewable screen makes use of visible lights such as televisions, liquid crystal displays (LCDs), and touchpad devices
Visible light is also used by plants in photosynthesis

47
Q

Laser is an acronym for

A

Light Amplification by Stimulated Emission of Radiation.

48
Q

used in many medical procedures such as optical imaging, surgery, endoscopy and treatment.”

A

laser

49
Q

radiation ranges from 8 x 1014 to 1017 Hz. And its wavelength range is 6 x 10-10 to 4 x 10-7.

A

ultraviolet radiation

50
Q

Ultraviolet radiation is more popularly known as UV, which was discovered by German physicist

A

Johann wilhelm ritter

51
Q

what are the 3 kinds of uv rays?

A

uva, uvb, uvc

52
Q

It accounts for 95% of the solar UV reaching Earth.

It penetrates the dermis.

A

uva

53
Q

Most UVB is filtered by the ozone in the atmosphere.

It affects the topmost layer (epidermis) of the skin.

A

uvb

54
Q

UVC is almost completely absorbed by the atmosphere and does not reach Earth’s surface.

A

uvc

55
Q

what are the sources of uv rays?

A

sun and special lamps

56
Q

what are the uses of uv lights?

A

Used to detect forged bank notes
Makes the security marker ink that is used in signing bankbooks visible
used in forensic investigations at crime scenes
used to sterilize medical equipment and purify water
used in pest control devices

57
Q

uv lights are more popularly known as?

A

black light

58
Q

X-ray is sometimes called the

A

roentgen ray

59
Q

X-ray is sometimes called the Roentgen Ray, in honor of its discoverer, German physicist

A

wilhelm conrad roentgen

60
Q

have lower energy

than hard x-ray and can penetrate soft substances such as flesh and bones.

A

soft x-rays

61
Q

have higher

energy and are mainly used in industries.

A

hard x-rays

62
Q

ow are X-RAYS produced?”

A

by sun and other stars

when accelerated electrons hit a metal and some medical equipment

63
Q

what are the uses of x ray?

A

used to detect abnormalities in the skeletal system
used in dental imaging
taking photographs of the internal body (CT scan)
used in airport security checks to scan passenger luggage

64
Q

are given off by radioactive elements such as cobalt and cesium. These are highly penetrating waves because of their short wavelengths ranging from less than 10-14 to 10-17 m.

A

gamma rays

65
Q

a French chemist and physicist that has been recognized as having discovered gamma rays in 1900.

A

paul villard

66
Q

Sources of Gamma Rays

A

sun
interstellar clouds
remnants of supernova

67
Q

what are the uses of gamma rays?

A

used in industries to detect cracks in metals and to sterilize equipment and commercial products
used to kill bacteria, insects and parasites that can cause foodborne diseases.

68
Q

what is the use of gamma rays in medical application

A

used to destroy cancer cells in a process called radiotherapy

69
Q

Planck’s constant that is equal to

A

6.63 x 10^-34 J.s.

70
Q

he greenhouse effect resulting from the increased concentration of greenhouse gases as a result of human activity is called

A

enhanced effect

71
Q

enhanced effect is also known as ??

A

anthropogenic greenhouse effect.”

periodical test 2 (8 decks)

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