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EM WAVES > EM WAVES > Flashcards

EM WAVES Flashcards

1
Q

Who discovered Electromagnetism?

A

James Clerk Maxwell

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2
Q

Who proved and justified the existence of Electromagnetic waves?

A

Heinrich Hertz

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3
Q

Who pioneered the use of radio waves and use of wireless telegraphy?

A

Gugliemo Marconi

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4
Q

What is the speed of light equivalent to?

A

3.0 x 10^8 m/s

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5
Q

What are the two kinds of waves?

A

TRANSVERSE and LONGITUDINAL

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6
Q

What are the units of wavelengths?

A

Nm and m

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7
Q

What are the units of frequency ?

A

Hz and /s

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8
Q

What is the sequence of the EM spectrum?

A

Radiowaves, Microwaves, Infrared, Visible Light, Ultraviolet, X-Rays, Gamma Rays

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9
Q

Used in communication in civilian aircraft

A

Radiowaves | VHF

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10
Q

Used for police radio communications and some Tv transmission

A

Radiowaves | UHF

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11
Q

The uses of the EM wave are : radio devices, EM radios etc.

A

Radiowaves

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12
Q

Used in National and Local Security Applications

A

Microwaves

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13
Q

RADAR acronym meaning

A

Radio Detection and Ranging

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14
Q

Examples of this wave is Speedtracking.

A

Microwaves

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15
Q

Example of this wave are Early Warning Radar, Missile Guidance System and Weather Monitoring.

A

Microwaves

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16
Q

values of Microwaves’ frequencies

A

300 mHz to 300 GHz

17
Q

Detected in Thermal Scanners, Night vision cameras and Tv remotes.

A

Infrared

18
Q

Frequency value of Infrared waves?

A

10^-3 to 10-1 m

19
Q

Spectrum Of Color ?

A

Red, Orange, Yellow, Green, Blue, Violet

20
Q

Optical Spectrum

A

Visible Light

21
Q

Type of UV rays that causes wrinkles and aging

A

UVA

22
Q

Type of UV rays that cause skin cancer/melanoma

A

UVB

23
Q

Frequency of UV rays?

A

300THz

24
Q

EM Wave that has the longest wavelength?

A

Radiowaves

25
Q

EM Wave that has the highest frequency?

A

Gamma Rays

26
Q

Can Radiowaves pass through objects?

A

No wtf

27
Q

Can X-Rays pass thru objects

A

Yes but pp of guys cant be exposed to it

28
Q

Used to study structure of crystals and solids

A

X-Rays

29
Q

2 Ways Gamma Rays can get thru affected area

HINT : ERBT and IR or BT

A

External Radiation Beam Therapy and Internal Radiation / Brachytherapy

30
Q

Formula of the Energy of an EM

A

E=hf

31
Q

Planck’s constant

A

6.626176 x 10^-34 Js

EM WAVES (1 decks)

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