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Science > 2 EM Waves > Flashcards

2 EM Waves Flashcards

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1
Q

A disturbance that transfer energy from one place to another

A

Wave

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2
Q

TWO IMPORTANT WAYS ON HOW
ENERGY IS TRANSPORTED

A
  1. MECHANICAL WAVES
  2. ELECTROMAGNETIC WAVES
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3
Q

is a wave that is not capable of transmitting its
energy through a vacuum.
- It requires medium to propagate

A

MECHANICAL WAVES

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4
Q
  • It does not require a medium to propagate.
  • Can travel not only through air and solid materials,
    but also through vacuum
A

ELECTROMAGNETIC WAVES

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5
Q

How are EM waves formed?

A

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

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6
Q

Electric field and magnetic field of an
electromagnetic waves are __________to each other

A

perpendicular

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7
Q

Electromagnetic waves are considered as __________waves.

A

transverse

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8
Q

Electromagnetic waves travels with a constant velocity of ____________ in vacuum

A

3.00X10^8 m/s

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9
Q

height of a wave, usually measuredin meters (m).

A

Amplitude

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10
Q
  • the distance between two
    consecutive crests or troughs of a wave.
A

Wavelength (Ζ›)

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11
Q

name of the symbol for wavelength

A

lambda (Ξ» / Ζ›)

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12
Q
  • the number of waves passing a
    point in a certain time. Usually measured in (1/s)
    or Hz.
A

Frequency (f)

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13
Q

c =
Ζ› =
f =

A

speed of light in vacuum
wavelength
frequency

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14
Q

triangle formula

A

C
Ζ› f

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15
Q

Types of Electromagnetic Waves:

A

● Radio waves
● Microwaves
β—Ύvisible light
● Infrared
● Ultraviolet
● X-ray
● Gamma Ray

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16
Q

As you move from left to right of the
Electromagnetic Spectrum, the
wavelengths get __________and
frequencies get ___________.

A

(Ξ»)–> smaller
(f)–>higher

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17
Q

The ____________ contains region of
electromagnetic waves from longest wavelengths to shortest wavelengths and from lowest frequencies to highest frequencies.

A

electromagnetic spectrum

18
Q

Frequency is measured in ________ or _______

A

cycles per second or Hertz

18
Q

Wavelength is measured in ________

A

meters

19
Q

The frequency of an EM wave is ______________ to
energy.

A

directly proportional

20
Q

In 1803, ___________ provided the first experimental evidence for a wave theory of light.

A

Thomas Young

21
Q

By the 1860s and 1870s , ____________ had provided a convincing wave description of light and other forms of electromagnetic radiation.

A

James Clark Maxwell

22
Q
  • Verified the predictions of
    Maxwell. EM waves are
    sometimes called Hertzian
    waves.
  • He showed how
    electromagnetic waves can
    be generated and detected
A

Heinrich R. Hertz(1888)

23
Q

EM waves that are invisible to the human eye.
Longest wavelength, lowest frequency

A

Radio waves

24
Q

Production of Radio waves:

A

Making electricity oscillate in an antenna

25
Q

Frequency range of Radio waves

A

30Hz - 300GHz

26
Q

Used in satellite communications, radar, phone networks, for cooking

Radio waves of very short wavelength

Generated by electronic devices

A

Microwaves

27
Q

Waves produced by hot objects

Lie in the region beyond the red end spectrum.

Most noticable when given off by hot objects, especially when objects are red hot.

Also called thermal or heat radiation

A

Infrared Waves

28
Q

Uses of Infrared Radiation: (5)

A

Pictures from satellites
Infrared scanners
Remote controllers
Infrared telescopes
Autofocus cameras

29
Q

Can be detected by the human eye

Caused by motion of electrons in an atom as they jump between orbits

A

Visible waves/
Visible light

30
Q

Produced by motion of electrons in atoms

Can cause chemical change in skin pigments resulting in skin darkening

Can cause damage in skin cells, cause sunburn and skin cancer.

A

Ultraviolet Waves

31
Q

Invisible radiation that lie beyond the violet end of the visible spectrum

A

UV waves

32
Q

3 types of UV waves

A

UV-C
UV-B
UV-A

33
Q

Describe UVC, UVB, UVA

A

UV-C = shortwave, disinfection
UV-B = small, most dangerous
UV-A = long wave, skin aging

34
Q

Uses of UV radiation: (4)

A

Production of vitamin D
Sterilizing water
UV lamps to check bank notes
Paints with fluorescents

35
Q

Have short wavelengths and high frequencies and are very penetrating.

Can damage living cells and cause cancer

Produced by rapid acceleration of electrons

A

X-rays

36
Q

Uses of X-ray (5)

A

X-ray photography
to inspect welded joints of faults
Crystallography
Astrophysics
Remote sensing

37
Q

Has highest energy in the em spectrum

Produced from nuclear reactions

High doses can kill

A

Gamma Rays

38
Q

Uses of Gamma Rays (5)

A

Kills cancer cells
Sterilizing medical equipment
Nuclear research
Geophysics
Mineral exploration

39
Q

Each particle contains a bundle of energy called a

A

Photon

40
Q

He discovered the existence of infrared by passing sunlight through a prism

A

Sir William Herschel

41
Q

The process of emitting energy

A

Radiation

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