Science P2

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Anonymous
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296365
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Science P2
Updated:
2015-02-20 08:04:22
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Science P2
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Science
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Science P2
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  1. electromagnetic radiation
    energy transferred as electromagnetic waves
  2. transmitted
    radiation that passes through a material
  3. transparent
    a material that allows light to pass through
  4. translucent
    a material that lets some but not all light pass through
  5. absorb
    to take in energy from electromagnetic radiation, this is transferred to the particles of the material
  6. reflect
    in the case of light, re-direction of the light wave, usually back to the point of origin from a shiny surface
  7. electromagnetic spectrum
    electromagnetic waves ordered according to wavelength and frequency- ranging from radio waves to gamma rays
  8. vaccum
    a space where there are no particles of any kind
  9. photon
    a 'packet' of electromagnetic energy depending on the frequency of the electromagnetic wave
  10. photon
    a 'packet' of electromagnetic energy depending on the frequency of the electromagnetic wave
  11. solar cells
    produce electricity
  12. electrons
    negatively charged ions
  13. atom
    the basic 'building block' of an element which cannot be chemically broken
  14. molecule
    two or more atoms held together by strong chemical bonds
  15. ion
    atom (or group of) with a positive or negative charge -caused by losing or gaining electrons
  16. ionising radiation
    electromagnetic radiation that has sufficient energy to ionise the material it is absorbed by
  17. gamma rays
    highest frequency electromagnetic radiation - most ionising
  18. x rays
    electromagnetic radiation used in hospitals - slightly ionising
  19. microwave
    electromagnetic wave similar to radio but of a higher intensity
  20. absorb
    to take in energy from electromagnetic radiation, this is transferred to the particles of the material
  21. ozone
    gas found high in the atmosphere which absorbs ultraviolet rays from the sun
  22. atmosphere
    thin layer of gas surrounding a planet
  23. green house effect
    the trapping of infra-red radiation by the earth's atmosphere
  24. principle frequency
    the main frequency of electromagnetic radiation emitted by an object. hotter objects have higher principle frequency
  25. carbon cycle
    the way in which carbon atoms pass between organisms and the environment
  26. respiration
    the process in living things where oxygen is used to release the energy in foods
  27. photosynthesis
    process carried out by green plants in which sunlight, carbon dioxide and water are used to produce glucose and oxyen
  28. global warming
    gradual increase in the earths surface average temperature
  29. analogue
    equipment that can display data with continuous values
  30. signal
    information that is transmitted by an electric current or electromagnetic wave
  31. moducated
    an electromagnetic wave that has been altered by an information signal
  32. carrier wave
    electromagnetic wave on which a signal is superimposed for transmission
  33. digital
    transmitted information that can take only a small number of discrete values usually just 1 and 0
  34. pulse
    a short on-phase
  35. binary digits
    a number that can only take the digits 1 or 0
  36. byte
    a measure of digital data consisting of 8 binary digits
  37. pixel
    a tiny area on a screen which conveys the data relating to a small part of a picture
  38. resolution
    the clarity of an image, which for a digital image depends on the number of pixels used

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