Physics 1 edexcel topic 1 gcse

gcse revision mind map on visible light solar system waves and reflection

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  • Created by: Chloe
  • Created on: 06-03-13 10:55
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  • Topic 1
    • Solar System
      • Ancient Greeks- Geocentric Model: all orbits Earth
      • Copernicus 1543 introduced Heliocentric Model: all orbits Sun
      • 1610, Galileo observed Jupiters moons and saw they orbitted Jupiter so proved not everything orbitted Earth and that the Geocantric Model was wrong.
      • Current model shows that the planets in our solar system orbit the sun but the orbits are elliptical and nnot circular.
      • As technology improves so does our understandingof the Universe eg the invention of the telescope led to the discovery of Uranus
    • Visible Light
      • Luminous objects in space give out visible light which travels as waves of energy.
      • Most of the stuff that astronomers and scientists have learnt has been by using the naked eye.
      • Most  objects in space are so far away that using the naked eye is only good for  mapping their positions.
      • Telescopes magnify images so distant objects can be seen in more detail.
      • Telescopes have problems eg light pollution, space telescopes overcome those issues but they are expensive.
    • Waves
      • Wavelength is the distance from one peak to the next.
      • frequency is how many complete waves there are per second: 1 Hz is 1 wave per second.
      • Amplitude is the height of the wave.
      • Speed is how fast it goes
      • waves transfer  energy and information- they don't actually transfer matter
      • Speed = frequency x wavelength
        • m/s = Hz x m
      • wave speed = distance    time
      • Transverse- vibrate at a 90 degree angle to the direction of travel
        • light and all EM waves
        • S- waves (earthquakes)
        • waves on strings and springs
        • ripples on water
      • Longitudal- vibrate along the same direction as the wave is travelling.
        • sound and ultrasound
        • P- waves (earthquakes)
        • slinky spring when you push and pull the end
      • oscilloscopes always show things as transverse waves even sound.
    • Reflection and Refraction
      • reflection
        • when a wave hits a boundary between one medium and another some of its energy is reflected.
          • why you can see your reflection in a puddle
        • the light is reflected due to a change in density. a different density causes light to be reflected at the boundary.
          • this is what happens in ultrascanning

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