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periodical test 2 > science > Flashcards

science Flashcards

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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
what is the uses of radio waves in medical application?
Magnetic Resonance Imaging (MRI) Reducing cellulite on the body and wrinkles and fine lines on the face Tightening sagging or loose skin
26
Extraterrestrial Sources of Radio Waves
JUPITER AND SUN
27
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.”
radio waves
28
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.
microwaves
29
is credited for discovering microwaves in 1864
james clerk maxwell
30
what is the use of microwaves in communication?
Sending signals for cable television, as well as video or audio feeds from production vans to broadcasting stations Long distance telephone calls
31
what are the other uses of microwaves?
Remote sensing for disaster management and mapping | Weather forecasting
32
what are the uses of microwaves in medical applications?
Uses the heat of microwaves to shrink or destroy tumors | Used to assess and monitor progress of treatment of breast cancer
33
infrared literally means what?
below red
34
It has a lower frequency than the red part of the visible light.
infrared waves
35
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.
infrared waves
36
a British astronomer, discovered IR in 1800.
Sir william herschel
37
cannot be seen by the naked eye but it can be felt as heat.”
infrared radiation
38
what are the uses of infrared waves?
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
what are the uses of infrared waves in medical applications?
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
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
visible light
41
what object did isaac newton used when he discovered the visible light?
prism
42
discovered the range of wavelength in the visible light spectrum when he refracted white light with a prism.
isaac newton
43
what is the wavelength of red?
760 nm
44
what does nm mean?
nenometers
45
what is the wavelentgh of orsnge
610 nm
46
what are the uses of visible light?
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
Laser is an acronym for
Light Amplification by Stimulated Emission of Radiation.
48
used in many medical procedures such as optical imaging, surgery, endoscopy and treatment.”
laser
49
radiation ranges from 8 x 1014 to 1017 Hz. And its wavelength range is 6 x 10-10 to 4 x 10-7.
ultraviolet radiation
50
Ultraviolet radiation is more popularly known as UV, which was discovered by German physicist
Johann wilhelm ritter
51
what are the 3 kinds of uv rays?
uva, uvb, uvc
52
It accounts for 95% of the solar UV reaching Earth. | It penetrates the dermis.
uva
53
Most UVB is filtered by the ozone in the atmosphere. | It affects the topmost layer (epidermis) of the skin.
uvb
54
UVC is almost completely absorbed by the atmosphere and does not reach Earth’s surface.
uvc
55
what are the sources of uv rays?
sun and special lamps
56
what are the uses of uv lights?
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
uv lights are more popularly known as?
black light
58
X-ray is sometimes called the
roentgen ray
59
X-ray is sometimes called the Roentgen Ray, in honor of its discoverer, German physicist
wilhelm conrad roentgen
60
have lower energy | than hard x-ray and can penetrate soft substances such as flesh and bones.
soft x-rays
61
have higher | energy and are mainly used in industries.
hard x-rays
62
ow are X-RAYS produced?”
by sun and other stars | when accelerated electrons hit a metal and some medical equipment
63
what are the uses of x ray?
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
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.
gamma rays
65
a French chemist and physicist that has been recognized as having discovered gamma rays in 1900.
paul villard
66
Sources of Gamma Rays
sun interstellar clouds remnants of supernova
67
what are the uses of gamma rays?
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
what is the use of gamma rays in medical application
used to destroy cancer cells in a process called radiotherapy
69
Planck’s constant that is equal to
6.63 x 10^-34 J.s.
70
he greenhouse effect resulting from the increased concentration of greenhouse gases as a result of human activity is called
enhanced effect
71
enhanced effect is also known as ??
anthropogenic greenhouse effect.”

periodical test 2 (8 decks)

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