Physics 1B

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  • Created by: Shine.7
  • Created on: 12-04-14 15:10
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  • Physics 1B
    • National Grid
      • High Volt- Low current ( REDUCE HEAT LOSS THROUGH CABLES)
      • step-up and step-down transformers
      • Plyons
        • ADV:easy to set up/+access/lower setup cost
        • DIS: Ugly /lots of maintance needed/less reliable
      • Underground
        • DIS: disturbs wildlife/hard to access/higher cost
        • ADV: hidden from view/minimal maintance/more reliable
    • UNIVERSE
      • CMBR ( low frequency radiation coming from all parts of universe)
      • It started from a very small point that exploded and started expanding. It radiated alot of heat and slowly cooled down (high frequency and now low frequency.)
      • RED-SHIFT:  galaxy have lower frequency(so shifted towards red-end spectrum.)
        • suggests galaxy- MOVING AWAY.
        • EVIDENCE: universe is expanding
          • The further away a galaxy= greater red shift
        • BLUE-SHIFT: MOVING TOWARDS us.
      • DOPPLER EFFECT:  Source is moving TO/AWAY from you changes in Frequency / Wavelenght.
        • TO: High F &SHORT WAVEL
    • LONGITUDINAL: parallel to direction of energy transfer
      • SOUND
    • TRANSVERSE: 90( perpendicular)
      • ALL EM WAVES
    • EM WAVES; GAMMON/XRAY/ULTRAVIOLET CONCERT/IT SAW VISIBILE LIGHT/AND A RED/MICROWAVE/WHICH TURNED INTO A RADIO!
      • INFRA: remotes + optical fibres
      • Radio: communications
        • Micro: Mobile phones+ satellite communications
          • PROBLEM: microw. wavelenghts are absorbed by water and heated up. DANGER. also especially if you live near a mast.
    • REFLECTION: Normal/90/INCIDENCE= REFLECTION
      • REFRACTED: new material+change in direction.
        • DIFFRACTION: spreading out/ through gap/. (straight lines/diffracts at edges/maximum diff-full semi.
      • ECHOES (sound reflected.)
    • BTG:  Chem energy stored/combusted/steam/turbine on/generator produces electricity.
      • BIOFUELS made from plants/waste. USING RENEWABLE SOURCE TO PRODUCE ELECTRI.
  • AWAY: LOW F& LONG WAVEL
  • SOUND:  High F=High Pitch (short wavelenght)
  • Low F=Low Pitch (longer wavelenghts)

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