4. Electromagnetic Waves Flashcards

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1
Q

Electromagnetic Waves

6 Properties

A

All electromagnetic waves:

  1. are made up of electric and magnetic fields oscillating perpendicularly to the direction of wave propagation
  2. are transverse waves
  3. do not carry electric charges
  4. can travel without a medium, with a speed of 3.0 x 108 m/s in a vacuum (no matter what type)
  5. undergo reflection and refraction
  6. transfer energy

v = fλ applies to all electromagnetic waves

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2
Q

State the order of electromagnetic waves based on increasing wavelength

A
  1. Gamma rays
  2. X-rays
  3. Ultraviolet radiation
  4. Visible Light
  5. Infrared radiation
  6. Microwaves
  7. Radio waves
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3
Q

State the order of electromagnetic waves based on increasing frequency

A
  1. Radio waves
  2. Microwaves
  3. Infrared Radiation
  4. Visible Light
  5. Ultraviolet radiation
  6. X-rays
  7. Gamma rays
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4
Q

Radio Waves

Examples

A
  1. Television and radio communication
  2. Radio telescopes for radio astronomy
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5
Q

Microwaves

Examples and Hazardous Effects

A

Examples:
1. Microwave oven
2. Wi-fi signals
3. Mobile Phone communication
4. Global Positioning System

Hazardous effects:
Heating effect (temperature increases)

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6
Q

Infared Radiation

Examples and Hazardous Effects

A

Examples:
1. Remote control
2. Intruder alarm
3. Thermal imaging (infared camera)

Hazardous effect:
Heating effect (temperature increases)

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7
Q

Visible Light

Examples

A
  1. Photography
  2. Optical fibres in medicine and telecommunication
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8
Q

Ultraviolet Radiation

Examples and Hazardous Effects

A

Examples:
1. Sterilisation of medical equipment
2. Sunbed for artificial tanning

Hazardous effects:
1. Prolonged exposure to UV radiation can lead to sunburns, premature aging and increased risk of skin cancer
2. UV radiation can be ionising

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9
Q

Ionising Radiation

What is it and Effects

A
  • Radiation that has the energy to remove elections from atoms or molecules, thereby ionising them.
  • Exposure to ionising radiation can lead to cell death, mutations and abnormal cell division.
  • May cause cancers such as leukaemia or deformities to a developing foetus
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10
Q

X-rays

Examples and Hazardous Effects

A

Examples:

  1. Scan luggage for prohibited items at airport
  2. Radiograpy to produce X-ray imaging to diagnose fractured bones or tooth decay

Hazardous Effects:

  1. Ionising radiation
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11
Q

Gamma Rays

Examples and Hazardous Effects

A

Examples:
1. Sterilisation of medical equipment
2. Sterilisation of food

Hazardous Effects:
1. Ionsing radiaton

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