Physics 1B
- 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.
- Micro: Mobile phones+ satellite communications
- 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.)
- REFRACTED: new material+change in direction.
- BTG: Chem energy stored/combusted/steam/turbine on/generator produces electricity.
- BIOFUELS made from plants/waste. USING RENEWABLE SOURCE TO PRODUCE ELECTRI.
- National Grid
- AWAY: LOW F& LONG WAVEL
- SOUND: High F=High Pitch (short wavelenght)
- Low F=Low Pitch (longer wavelenghts)
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