P1 AQA Last Minute Revision Notes

Concise last minute revision notes for P1.

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  • Created by: Arjun
  • Created on: 15-06-11 15:36
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1. Heat Transfer
· Thermal radiation = infra-red radiation (beyond red part of visible spectrum)
· Surface of sun is 5500 degrees.
· Greenhouse effect is the idea that the earth is a greenhouse, and the
atmosphere is glass that stops substances exiting or entering.
· DARK, MATT SURFACES emit more radiation than shiny, light ones, and
absorb radiation better.
· Conduction: free electrons are given energy where heated and diffuse ­
this energy is passed on as electrons collide.
o A conductor can pass on this energy much quicker.
· Shiny, light surfaces reflect radiation the best.
· Convection occurs with only liquids or gases.
· Hot, light air rises, whilst cold, dense air sinks. This causes convection
current in gases and liquids.
· This occurs because fluids expand when heated making them lighter.
· Vacuum flask:
o Vacuum cuts out heat transfer by conduction and convection.
o Glass is poor conductor so little heat conducted here.
o Glass surfaces are silvery to reduce radiation from outer wall.
· Homes:
o Double glazed window with vacuum reduces conduction.
o Cavity wall insulates reducing heat loss.
o Loft insulation reduces heat loss through roof.
2. Using Energy
· Chemical energy ­ stored in fuel (food aswell)
· Kinetic energy ­ movement
· Gravitational potential energy ­ due to position
· Elastic energy ­ stored in springy object
· Electrical energy ­ transferred by electric current
· Thermal energy ­ due to temperature.
· Energy is ALWAYS transformed, never created or destroyed.

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Useful energy transferred to where it is wanted.
· Wasted energy is not used.
· Wasted energy spreads out to the surroundings, e.g. as heat
· Weight is measured in newtons (N).
· Efficiency = useful energy transferred
Total energy supplied
· We can show energy transferral as a Sankey Diagram.
3.…read more

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They produce greenhouse gases
o They're non renewable
o Produce sulfur dioxide = acid rain
· Although renewable is better, it can take up space, need large areas of
land, not look particularly good, and not produce as much energy as fossil
5. Electromagnetic Waves
· Energy transferred depends on the wavelength of waves.
· Wavelength is distance from one peak to the next wave peak.…read more

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· A Geiger Counter can be used to detect radioactivity.
· Marie Curie first was able to describe the new property of uranium as
· Alpha = stopped by paper
· Beta = went through it.
· Gamma was discovered later ­ it is more penetrating than Beta.
· An unstable nucleus decays when it emits radiation ­ this is a random
· X-rays are highly ionising.
· Alpha has the greatest ionising effect, making it more dangerous inside the
body.…read more



Very clear, concise and well presented. Thank you :)


Omggg thank you! Just the thing I was looking for!!**

Anisa -Team GR

Its an amazing resoures for last mintue revision it highlights all the keypoints


thank you so much yahhh

(dfbfeafgvsf) over excited

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