Waves

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  • Created by: Tom Bowen
  • Created on: 26-05-14 15:29
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  • WAVES
    • Amplitude, wavelength, frequency, periods.
      • Amplitude
        • height of wave from middle line to peak.
      • Wavelength
        • covers full cycle of a wave
      • Frequency
        • how many complete waves per second
        • measure in HERZ (H)
      • Peroids
        • time taken to complete one wave
    • Equatons
      • Speed=distance over time
      • speed=frequency x wavelength
    • The Electromagnetic Spectrum
      • 7 wave types, travel speed of light .
        • 1. RADIO WAVES (LONGEST WL,LOWest F)
          • communication
        • 2. MICROWAVES
          • Cooking
          • Communication
        • 3. INFRA-RED
          • Heating
          • Burn skin
          • Remote control
        • 4. VISIBLE LIGHT
          • eyes detect
          • burn eyes
        • 5. ULTRA-VIOLET
          • tans
          • skin cancer
        • 6. X-RAYS
          • broken bones
          • cancer
        • 8. GAMMA RAYS (SHORTEST WL, HIGH F)
          • nuclear
          • cancer
          • keep food fresh
    • Green houses effect
      • CO2 + Methane
        • temp balance between heat-sun and heat -space
        • atmosphere-insulating, keep planet warm
        • keeps getting hotter and hotter
        • greenhouse gases rising=global warming
      • floods/droughts
        • changes in patterns
        • melt ice caps=flods
      • increasing
        • co2 balanced. released-respiration
        • massive amounts of fossil fuels
        • deforestation
        • gone up-20%= over heating planet
    • Reflection, Refraction
      • REFLECTION
        • reflects light to allow us to see
      • REFLECTION
        • uneven surface- relfecs different angle
      • REFRACTION
        • waves change speed as they move
        • change in speed=change in direction
        • wavelength changes
    • Communication
      • TELECOMMUNICATIONS
        • Microwaves, satellite links
      • OPTICAL FIBRE
        • internal reflection
        • faster
        • little energy lost
        • little environmental damage
        • Very expensive
        • very secure
        • Precisely Installed
    • Health Risks
      • high power transmitters=dangerous to nearby resisidents
        • Evidence-anecdotal
          • Dizziness
          • cancer
          • nausea
  • Vibrations,
    • Most waves are Transverse
      • light waves
      • direction of disturbance creating the wave is at a right angles to the wave travel.
      • e.g ripples on water, waves on string
    • Longitudinal
      • the direction of disturbance creating wave is in same direction
      • e.g sound waves, shock waves
  • DISADVANTAGES
  • ADVANTAGES

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