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Pro Physics > P13 > Flashcards

P13 Flashcards

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1
Q

What are EM waves?

A

Transverse waves that transfer energy from a source to an absorber.

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2
Q

Whats an example of am EM wave?

A

Hot object transferes energy by emitting infrared radiation which is absorbed by the air.

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3
Q

What do all EM waves travel at?

A

The same speed through air or a vaccum

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4
Q

Radio waves wave length?

A

1m - 10^4m

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5
Q

Micro waves wavelength?

A

10^-2m

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6
Q

Infra red wavelength?

A

10^-5m

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7
Q

Visible light wave length?

A

10^-7m

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8
Q

Ultra violet wave length?

A

10^-8m

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9
Q

X-rays wave length?

A

10^-10

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10
Q

Gamma rays wave length?

A

10^-15

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11
Q

Why is there a large range of frequencies?

A

Because EM waves generate by a variety of changes in atoms and their nuclei

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12
Q

What do human eyes detect?

A

Visible light

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13
Q

How are radio waves made?

A

Oscillating charges

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14
Q

What happens when radio waves are absorbed?

A

They create alternating currents with the same frequency as the radio wave itself

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15
Q

What can changes in atoms and nuclei result to?

A

EM waves generated or absorbed over a wide frequency range

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16
Q

Where do gamma rays originate from?

A

Changes in nucleus of an atom

17
Q

What effects do UV, Xrays and gamma rays have on the human body?

A

Effect human body tissue

18
Q

What is radiation dose?

A

Is measure of risk exposing the body to radiation

19
Q

100msv =

A

1Sv

20
Q

What can UV increase?

A
  • Skin age to increase
  • Skin cancer
21
Q

Uses of radio waves?

A

Television and radio

22
Q

Uses of microwaves?

A

Satelite communication and cooking food

23
Q

Use of infrared

A

Electrical heaters, cooking food,infrared cameras

24
Q

Uses of visible light?

A

Fibre optic communications

25
Q

Use of ultraviolet?

A

Energy effecient lamps, sun tanning

26
Q

Uses of xrays and gamma rays?

A

Medical imaging and treatement

Pro Physics (14 decks)

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