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RC1031 Common Module > the electromagnetic spectrum > Flashcards

the electromagnetic spectrum Flashcards

1
Q

what do mechanical waves require

A

a medium

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2
Q

what do EM waves require

A

a vacuum eg x-rays

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3
Q

give an example of longitudinal waves

A

sound waves

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4
Q

give an example of transverse waves

A

EM waves

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5
Q

direction of longitudinal waves

A

same direction of travel and energy transfer

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6
Q

direction of transverse waves

A

right angles to direction of travel and energy transfer

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7
Q

what are the 7 groups of EM spectrum

A
  1. radio waves
  2. microwaves
  3. infrared
  4. (visible) light
  5. ultraviolet
  6. x-rays
  7. gamma rays
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8
Q

name 4 properties of EM radiation

A
  1. propagates in straight lines
  2. crucial in imaging
  3. carries energy in a mass less from
  4. all travel at the speed of light
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9
Q

what is constant speed/ velocity equal to?

A

wave speed (metre per second) + wavelength (metre) x freq (hertz)

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10
Q

equation for energy of a photon

A

E=hv
energy of photon (joules) = planck’s constant x freq (hertz)

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11
Q

planck’s constant

A

constant between energy carried out by photon and the frequency of its associated magnetic wave
6.62 x 10-34 J per second

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12
Q

What is the effect of frequency on EM energy?

A

EM radiation/ wave energy is proportional to frequency
Eg EM radiation with high frequency has high energy

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13
Q

Effect of wavelength of EM energy

A

EM radiation energy is inversely proportional to wavelength
I.e. short wavelength = high energy EM radiation

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14
Q

What waves does mri use

A

Radio waves

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15
Q

What can microwaves be used to treat

A

Microwave ablation

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16
Q

What imaging is infrared used for (thermography)

A

Breast imaging
Hotter areas/ objects emit more infrared radiation

17
Q

What is ultraviolet radiation used for?

A

Germicidal radiation
Treatment of skin conditions

18
Q

What is gamma rays used for

A
  • radionuclide imaging (RN)
  • sealed and unsealed source radiotherapy
19
Q

what modality does not use EM

A

Ultrasound

20
Q

what do transverse waves have?

A

both an oscillating electric and magnetic field

21
Q

rank visible lights in order of freq high to low

A
  • violet
  • indigo
  • blue
  • green
  • yellow
  • orange
  • red
22
Q

what is the trend is length of wavelength of visible light

A

the lowest frequency light has the longest wavelength

23
Q

EM radiations in order of frequency from high to low

A
  • gamma rays
  • x rays
  • uv rays
  • visible
  • infrared
  • microwaves
  • radiowaves
24
Q

what is half life

A

the amount of time needed for half of a sample of unstable atoms or particles to undergo decay

RC1031 Common Module (5 decks)

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