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Physics > P12 - Electromagnetic Waves > Flashcards

P12 - Electromagnetic Waves Flashcards

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1
Q

What are Electromagnetic Waves?

A

Transverse waves that transfer energy from the source of the waves to an absorber.

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2
Q

What order do the waves come in the Electromagnetic Spectrum?

A

1) Radio Waves
2) Microwaves
3) Infared Radiation
4) Visible Light
5) Ultraviolet
6) X-rays
7) Gamma Rays

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3
Q

What is colour spectrum on Visible Light?

A

Red to Violet

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4
Q

What wave has the Longest Wavelength and the Lowest Frequency?

A

Radio Waves

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5
Q

What wave has the Shortest Wavelength and the Highest Frequency?

A

Gamma Rays

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6
Q

What has a shorter wavelength Visible Light or Infared Radiation?

A

Visible Light

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7
Q

What has the Lowest Frequency Ultraviolet or X-rays?

A

Ultraviolet

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8
Q

What is the only Electromagnetic Wave can our eyes detect?

A

Visible Light

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9
Q

How are the waves grouped in the Electromagnetic Spectrum?

A

Wavelength and Frequency

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10
Q

What velocity do electromagnetic waves travel at?

A

The same velocity through a vacuum (space) or air.

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11
Q

What practical applications are radio waves used for?

A

Television and Radio

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12
Q

What practical applications are microwaves used for?

A

Satellite communications and Cooking Food

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13
Q

What practical applications are infared used for?

A

Infared Cameras and Cooking Food

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14
Q

What practical applications are Visible Light used for?

A

Fibre Optic Communications

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15
Q

What practical applications are Ultraviolet used for?

A

Sun Tanning and Energy Efficient Lamps

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16
Q

What practical applications are X-rays used for?

A

1) Airport Security

2) Medical X-Rays and CT Scan

17
Q

What practical applications are Gamma Rays used for?

A

1) Sterilisation of Medical Equipment

2) Cancer Therapy (Radio Therapy).

18
Q

What is the Wave Speed Equation?

A

Wave Speed (m/s) = Frequency (Hz) x Wavelength (m)

19
Q

What are the Dangers of Radio Waves?

A

No known Dangers

20
Q

What are the dangers of Microwaves?

A

Can penertrate the body and heat internal organs.

21
Q

What are the dangers of Infared Radiation:

A

It can damage, burn or kill skin cells (heats up cells).

22
Q

What are the dangers of Visible Light?

A

Can damage your eyes.

23
Q

What are the dangers of Ultraviolet?

A

Sun Burn, can lead to skin cancer and damages eyes.

24
Q

What are the dangers of X-rays?

A
  • Can cause cancer, as it MUTATES DNA.

- Kills Cells

25
Q

What are the dangers of Gamma-Rays?

A

Tissue Damage and Kill Cells

26
Q

What wave is associated with Heat?

A

Infared Radiation

27
Q

A siren emits a note which has a frequency of 430 Hz and a wavelength of 0.8 m. What is the speed of this sound?

A

Wave Speed = 430 x 0.8

= 344 m/s

28
Q

What is the wavelength of a sound wave with frequency 100 Hz and Wave Speed of 344 m/s?

A

Wave Length = Wave Speed / Frequency

Wave Length = 344 / 100
= 3.44 m

29
Q

What sort of Radiation is X-rays and Gamma Rays and what does that mean?

A

Ionising radiation, which causes the mutation of genes (DNA) and cancer.

30
Q

What does Radiation Dose mean?

A

Is a measure of the risk of harm resulting from an exposure of the body to the radiation.

31
Q

What Unit is measured for Radiation Dose?

A

Sievert (1 seivert = 1000 millisieverts)

32
Q

Where do Gamma Rays originate from?

A

Changes in the nucleus of an atom.

33
Q

If one can has a Matte Black outside surface and the other a Shiny Aluminium surface which will gain heat easiest?

A

The matte black surface will due to fact that black and matte are better absorber unlike the shiny aluminium surface which which reflect the heat.

34
Q

How can radio waves be produced?

A

By oscillations in electrical circuits.

35
Q

How do radio waves travel far distances?

A

When radio waves are absorbed they may create an alternating current with the same frequency as the radio wave itself, so radio waves can themselves include oscillations in a electric circuit.

36
Q

What waves are used for Nuclear Weapons?

A

Gamma Rays

37
Q

What do changes in the atoms and the nuclei of atoms have on electromagnetic waves?

A

Being generated or absorbed over a wide frequency range (very destructive).

Physics (11 decks)

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