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Flashcards

Physics P1

Beth Goodchild Physics GCSE Inglês 43 flashcards

Energy transformations can be shown by Sankey Diagrams. This Sankey Diagram shows the energy transformed from an electric…

Flashcards do conjunto (43)

  1. 1What happens when energy flows away from a warm object?The temperature of the object decreases.
  2. 2In a thermogram, what colour shows the hottest, and what colour shows the coldest parts of the scale?Hottest = White / Yellow
    Coldest = Blue / Purple
  3. 3What is specific heat capacity? What's the SHC of water?The SHC is the amount of energy needed to raise 1Kg of a substance by 1°C.
    SHC of Water = 4.2 J/Kg°C
  4. 4What is the equation for energy transferred by specific heat capacity?Energy Transferred = Mass x SHC x Temperature change
  5. 5What is Specific Latent Heat?It is the amount of energy needed to melt or boil 1Kg of a substance. (J/Kg)
  6. 6When something changes state, what happens to the temperature?It stays the same.
  7. 7What is the equation for energy transfer by specific latent heat?Energy Transferred = Mass x SLH
    (J/Kg)
  8. 8Energy is needed to break bonds when a substance is changing state. This explains why there is...No change in temperature.
  9. 9What is between two panes of glass in double glazed windows? Why?Either gas or a vacuum. This is so energy (heat) cannot be conducted away from the inside of the building.
  10. 10What methods of energy transfer does loft insulation reduce heat loss by?> Conduction
    > Convection
  11. 11What methods of energy transfer does cavity wall insulation reduce heat loss by?> Conduction
    > Convection
  12. 12Insulation blocks reduce heat loss by radiation. How do they work in the: a) Summer? b) Winter?In the summer they radiate heat from the sun back outside of the house to keep the house cool.
    In the winter heat from the house is radiated back into the house to keep the house warm.
  13. 13Energy transformations can be shown by Sankey Diagrams. This Sankey Diagram shows the energy transformed from an electric lamp. (Flip card).Energy transformations can be shown by Sankey Diagrams. This Sankey Diagram shows the energy transformed from an electric lamp. (Flip card).
  14. 14What is the equation for payback time?Payback Time = Cost of Insulation ÷ Annual Saving
  15. 15—The frequency is the amount of complete waves passing a point in one second, in Hertz (Hz).The frequency is the amount of complete waves passing a point in one second, in Hertz (Hz).
  16. 16When does Diffraction occur?When waves pass through a gap and then spread out.When does Diffraction occur?
  17. 17What are the 7 types of wave in the Electromagnetic Spectrum?Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma ray.
    (RMIVUXG)
  18. 18White light is made up of...Different colours of different frequencies out of phase.
  19. 19What type of light is in phase, shows no divergence and only has a single frequency?Laser Light.
  20. 20Refraction usually occurs when...Light travels from one material to another.
  21. 21Total Internal Reflection (TIR) occurs when...When the angle of incidence is bigger than the critical angle.
  22. 22When the angle of refraction is 90°C the angle of incidence is called the ________ _____.Critical angle.
  23. 23How far can microwaves penetrate into food?Up to 1cm.
  24. 24How is energy transferred?By Wave.
  25. 25The amount of energy transferred depends on the frequency or wavelength of the wave. A wave with a higher frequency (therefore a short wavelength) transfers ____ energy.More energy.
  26. 26Microwaves have wavelengths between _ mm and __ mm.1mm and 30mm.
  27. 27Mobile phones transfer less energy than a microwave. Why?Because they have a longer wavelength.
  28. 28Why are aerials normally on the top of buildings?So they are in 'line of sight' with the transmitter / receiver.
  29. 29Bad weather and large areas of water can scatter microwave communication signals. This is because...They do not show much diffraction.
  30. 30What are the advantages of switching from analogue to digital TV and Radio?> Improved signal quality for picture and sound
    > Wider range of programmes
    > Interaction with programme enabled
    > More information available, e.g; guides, subtitles.
  31. 31How do optical fibres transmit data?By sending pulses of light down a solid optical fibre.
  32. 32Radio, television, laptops and mobile phones are al examples of...Wireless Technology.
  33. 33What happens to radio waves in the earth's atmosphere?They are reflected and refracted depending on the frequency of the wave.
  34. 34Radio waves are reflected from the ionosphere.Water reflects radio waves, however land does not.
  35. 35Microwaves can pass through the ionosphere. What happens to them when an orbiting satellite receives a microwave signal?The satellite amplifies the signal, then retransmits it to earth.
  36. 36When a radio wave hits an obstruction, what happens to it?It diffracts.
  37. 37—> P waves can pass through solids AND liquids.
    > S waves can only pass through solids.
    > L waves are slow moving.    > P waves can pass through solids AND liquids. > S waves can only pass through solids. > L waves are slow moving.
  38. 38What pigment produces a tan?Melanin, found in the skin cells.
  39. 39Where is 'ozone' found?In the Stratosphere.
  40. 40How do CFC gasses cause danger to humans?They break down the ozone layer, which would usually protect the earth from too much UV light. Too much UV on the skin can cause skin cancers.
  41. 41Where is the ozone layer its thinnest? Why?The South Pole, as the ozone destroying chemicals work best in cold conditions.
  42. 42Satellites help monitor the thickness of...The ozone layer.
  43. 43Longer wavelengths ________ around objects.Diffract.

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GCSE Physics FlashCards sobre Physics P1, criado por Beth Goodchild em 24-05-2015.
Criado por
Beth Goodchild
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