Core Physics - Topic 1 Visible Light & The Solar System

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  • Created by: Katie
  • Created on: 09-04-13 17:34

The Solar System

    Copernicus - HELIOCENTRIC                  Ptolemy - GEOCENTRIC

(http://bclearningnetwork.com/LOR/media/sc09/onlinefiles/41c_helio_geocentric.gif)

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The Solar System Continued

  • PtolemyGEOCENTRIC
    • Sun, Moon and planets move in orbits
    • Everything obits the Earth
  • Copernicus - HELIOCENTRIC
    • Moons orbit the planets
    • Planets obit the Sun
  • Telescopes improved - Planets discovered
    • Uranus, Neptune and Pluto
  • Luminous objects in space give out visible light
    • Travels as waves of energy
    • Visible light waves allow studying of distant objects
  • Objects in space give out other types of waves
    • e.g. radiowaves and microwaves
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Refracting Telescopes

  • Light travels in straight lines but can change direction
  • Change in direction - REFRACTION
    • Occurs at the interface between 2 materials
  • A lens is shaped so its interface changes directions of parallel light waves
  • A converging/convex lens
    • curved on both sides making a thicker middle
    • light rays enter and come together - converge
    • focuses the rays
  • Distance between focus and lens = focal length
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Waves

Traverse waves - particles move at right angles to the direction wave is travelling
Longitudinal waves - particles move back and forth in the direction wave is travelling

  • Electromagnetic waves
    • Light, radio waves, microwaves
    • Traverse
    • Do not need a medium to travel through
  • Seismic waves
    • Earthquakes, explosions
    • Longitudinal or traverse
    • Travel through the Earth
  • Sound waves
    • Longitudinal
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Waves Continued

  • Wave frequency
    • Number of waves passing a point each second
    • Measured in hertz (Hz)
    • 1 Hz = 1 wave per second
  • Wavelength
    • Distance from a point on one wave to the same point on the next
    • Measured in meters
  • Amplitude
    • Maxium distance of a point on the wave from its rest position
    • Measured in meters
  • Wave speed
    • How fast the energy in a wave travels

Wave speed (m/s) = distance(m)                v = x
                                    time(s)                        t

Wave speed (m/s) = frequency (Hz) x wavelength (m)        v = ⨍ x λ

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