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Physics Term 2 > Electromagnetic Radiation (ER) > Flashcards

Electromagnetic Radiation (ER) Flashcards

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1
Q

ER

A

Caused by accelerating charges.
Have a changing magnetic field.
Changing mag field induces a perpendicular changing electric field. Induces a changing magnet.

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2
Q

EM Energy?

A

Has energy associated with it so it transfers energy.

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3
Q

EM Medium

A

Does not need a medium to travel in and so can travel through a vacuum.

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4
Q

EM travels at?

A

Travels at the speed of light so c = 3x10^8m/s-1

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5
Q

EM spectrum

A

Range of frequencies of EM radiation.

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6
Q

Radio waves info?
(Red)

A

Longest λ
Lowest f
Lowest penetrating energy

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7
Q

Radio waves uses ?

A

Very high frequency . TV
Ultra high frequency .cell phones
Low penetrating ability due to lowest energy

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8
Q

Microwaves info

A

Long wavelength
Low frequency
Low energy

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9
Q

Microwave uses?

A

Microwave oven - cooked food
Satellites
Radar

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10
Q

Infrared from

A

Hot objects

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11
Q

Infrared info?

A

Long wavelength
Low frequency
Low energy cannot be detected by human eye but we can feel warmth

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12
Q

Infrared uses?

A

Remote controls
Night vision equipment

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13
Q

Infrared uses?

A

Remote controls
Night vision equipment

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14
Q

Visible light info?

A

Medium wavelength
Medium frequency
Medium energy
More penetrating than infrared

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15
Q

Ultraviolet rays from?

A

The sun

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16
Q

Ultraviolet rays info?

A

Short wavelength
High frequency
High energy
Produce vitamin C

17
Q

Ultraviolet rays uses ?

A

Fluorescent lights give off UV

18
Q

Ultraviolet rays info?

A

Short wavelength
High frequency
High energy

19
Q

X rays info?

A

Short wavelength
High frequency
High energy

20
Q

X ray uses ?

A

X ray imaging
Detecting cracks in metal

21
Q

Gamma Rays

A

Nuclear reactions

22
Q

Gamma rays info ?

A

Shortest wavelength
Highest frequency
Highest energy
Can penetrate human tissue

23
Q

Gamma rays uses ?

A

Destroy cancerous cells
Sterilize surgical equipment

24
Q

Particle nature

A

Energy is emmited in packets called quanta

25
Q

Quanta

A

Discrete quantities of energy which are proportional to the frequency of the radiation they represent

26
Q

Einstein

A

Em radiation emits energy as a wave but it is divided up into quanta called photons

27
Q

Photon

A

A parcel of energy by electromagnetic radiation

Physics Term 2 (6 decks)

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