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For Group Study > Forms Of Electromagnetic Waves > Flashcards

Forms Of Electromagnetic Waves Flashcards

1
Q

Are transverse waves that carry energy from one place to another.

A

Electromagnetic waves

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2
Q

The different types of Electromagnetic(EM) waves.

A

Radio waves, microwaves, infrared waves, visible light, ultraviolet rays, X-rays, and gamma rays

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3
Q

Are signals that oscillate, so the amplitudes of the electric and magnetic fields vary at a specific rate.

A

EM waves

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4
Q

EM waves are often classified by frequency in a scheme called the _____________.

A

Electromagnetic spectrum

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5
Q

It consist of waves used mostly for communication.

A

Low radio frequency region

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6
Q

Are used for radar tracking, radio navigation, communication, medical Diathermy, heating in microwave ovens, drying and other industrial purposes.

A

Microwaves

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7
Q

The ________ of the spectrum is often emitted and absorbed because of the vibrations of atoms and molecules.

A

Infared portions or waves

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8
Q

Infrared waves are sometimes called

A

Heat or thermal radiation.

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9
Q

Have the longest wavelengths in the electromagnetic spectrum.

A

Radio waves

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10
Q

Is a rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents that carry radio signals.

A

Radio Frequency (RF)

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11
Q

Who invented the conventional telephone in 1876

A

Alexander Graham Bell

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12
Q

Who discovered the existence of infrared by passing sunlight through a prism.

A

William Herschel

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13
Q

It has wavelength of 1 to 2 km.

A

Long wave

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14
Q

It has a wavelength of around 100 m and is used in amplitude modulation (AM) stations
Frequency range between 550 kHz to 1600 kHz

A

Medium wave

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15
Q

have a wavelength of around 2 m, it is used by frequency modulated (FM) radio stations and are within the range of 88 to 108 MHz.

A

Very High Frequency (VHF) waves

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16
Q

they have a wavelength of less than a meter.
This type of radio wave is used for television broadcasting, cordless phones, walkie-talkies, police radio communications and aircraft radios.

A

Ultra High Frequency (UHF) waves

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17
Q

They are important components of all equipment that use radio waves in systems like radio broadcasting, television broadcasts, cellular phones and satellite communications.

A

Antennas

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18
Q

are basically extremely high frequency radio waves. They have very short wavelengths ranging from approximately 1 mm to 30cm.

A

Microwaves

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19
Q

Microwave oven uses a __________ , it is a transmitter that converts electrical energy into microwave radiation.

A

Magnetron

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20
Q

have wavelengths between that of microwaves and visible light in the electromagnetic spectrum.

A

Infrared waves

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21
Q

One major source of infrared radiation is the ___.

A

Sun

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22
Q

_________ is a form of electromagnetic wave that enable us to see the physical world around us.

A

Visible light

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23
Q

It is one of the raw materials in the process called ______________

A

Photosynthesis

24
Q

it is separated into its component lights in different wavelength this phenomenon is called _______.

A

Dispersion

25
Q

A ______ is a device that emits light through a process of optical amplification

A

Laser

26
Q

A laser is a device that emits light through a process of _______________.

A

Optical amplification

27
Q

__________ have longer wavelength and can penetrate deeper in the skin than UVB.

A

Ultraviolet rays (UVA)

28
Q

Overexposure to UV may lead to

A

Skin cancer, melanoma, photokeratitis or sunburn of the cornea.

29
Q

UV rays are used to prevent

A

Counterfeiters

30
Q

_________ are high – energy waves which have great penetrating power and are used extensively in medical applications and in inspecting welds.

A

X-rays

31
Q

X- radiation is called _______________, after Wilhelm Conrad Roentgen, who named it as such in 1895, to signify an unknown type of radiation.

A

Rontgen radiation

32
Q

Overexposure to x –rays may lead to cancer such as ________.

A

Leukemia

33
Q

_____________ are electromagnetic waves that have 10000 times as much energy as the energy carried by visible light. It has the shortest wavelength among the EM waves and the highest frequency.

A

Gamma rays

34
Q

gamma rays are also used to treat some types of cancer. In the procedure called _____________, multiple concentrated beams of gamma rays are directed on the growth in order to kill the cancerous cells

A

Gamma knife surgery

35
Q

____________ is another form of high – energy radiation that comes from the outer space – beyond the solar system – but of unknown origin.

A

Cosmic radiation

36
Q

It is mostly consists high-energy particles of protons and atomic nuclei.

A

Cosmic radiation

37
Q

What are the examples of High Frequency EM Waves?

A

Ultraviolet rays, x-rays, cosmic rays, gamma rays.

38
Q

What are the examples of Low Frequency EM Waves?

A

Radio waves, microwaves, infrared waves, visible light

39
Q

The interaction of cosmic rays/radiation results

A

Aurora Borealis in the Northern hemisphere or Aurora Australis in the Southern Hemisphere

40
Q

It is closest in wavelength to visibile light

A

Near- infrared light

41
Q

It is closer to the microwave region of the EM spectrum.

A

Far infrared

42
Q

Can be used to remotely determine the temperature of objects.

A

Infrared radiation

43
Q

________ or _______ can remotely determine the temperature of objects

A

Thermography or Pyrometry

44
Q

Is EM radiation with a wavelength shorter than that of visible light, but longer than X-rays

A

Ultraviolet

45
Q

They are generated by radioactive atoms and in nuclear explosions, and are used in many medical applications.

A

Gamma rays

46
Q

it happens during this spontaneous change to be more stable.

A

Radioactive decay

47
Q

the radiation given off from the sun is called the?

A

solar spectrum

47
Q

the energy produced by nuclear reactions at the core of the sun, which is scientifically called?

A

electromagnetic radiation.

48
Q

there are many kinds of energy in the universe. One type of such energy is?

A

radiant energy

49
Q

is one of many different kinds of radiation that exist in nature.

A

EM radiation

50
Q

it is also created by changes in the state of an atom

A

Radiation.

51
Q

An especially damaging form of radiation is

A

ionizing radiation

52
Q

the basic unit used to measure exposure to ionizing radiation is the

A

sievert(Sv)

53
Q

Most often, radiation exposure is expressed in

A

millisieverts (mSv) or microsieverts.

54
Q

An older, non-standard

A

Systeme internationale (SI)

54
Q

but still often used unit of exposure is

A

rem (roentgen equivalent man)

55
Q

are radiation effects in which the chance of occurrence increases with the dose.

A

Stochastic effects

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