Physics Unit 1

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  • Created by: slr674
  • Created on: 22-09-14 16:46

Infrared Radiation

Dark, matt = GOOD radiation emitter, GOOD radiation aborber

Light, shiny = POOR radiation emitter, POOR radiation absorber, GOOD reflector of INRARED RADIATION

THE HIGHER THE TEMPERATURE = THE MORE ENERGY EMITTED AS INFRARED RADIATION

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Kinetic Theory

KENETIC THEORY = OBJECTS ARE MADE UP OF PARTICLES THAT ARE CONSTANTLY MOVING

SOLIDS: Particles VIBRATE about fixed positions. Solids have fixed shape.    Add energy

 LIQUIDS: Partiles move around, stay close together. Liquids can flow.    

 

 

 

The amount of energy a particle has is related to temperature of material

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Methods of transferring energy

CONDUCTION =

  • Particles in solid given more energy and vibrate more.
  • Collide with neighbouring particles, then they vibrate more

Energy spreads through solid. 

 

CONVECTION=

  • Particles in liquid or gas given more energy, move faster and spread out.
  • Density is lower so hot material rises
  • Replaced by cool material, so convection current is set up
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Rate of energy transfer

Evaporation takes place faster when:

  • Temperature is higher
  • Large surface area in contact with air
  • Wind blows water vapour away
  • Flask is made of INSULATING MATERIAL, slows energy transfer from hot liquid to outside by CONDUCTION.
  • Vacuum between two layers, so energy cannot be transferred by CONVECTION.
  • Silver coating reduces amount of enery transfer by RADIATION.
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Distributing Electricity

STEP-UP TRANSFORMERS = INCREASES voltage, DECREASES current

ADVANTAGES

  • Pylons are form of visible pollution.
  • People can be injured if climbing pylons, less likely to be injured by buried cables

DISADVANTAGES

 

  • Burying cables is more expensive
  • More difficult to make repairs
  • Digging trenches damages habitats temporarily
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