GCSE Physics

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GCSE Physics
2012-04-28 13:01:25
use waves communication provide evidence that univers expanding

Part one
Show Answers:

  1. What are waves
    Waves are vibrations that transfer energy from on place to place without without matter being transformed
  2. Waves have
    Amplitude ,wavelength and frequency
  3. Waves can be either
    Transverse or longitudinal
  4. Transverse waves have
    Sideways vibrations the vibrations are perpendicular to the direction of energy transfer of the wave
  5. Tarnsverse waves include
    • Light and all other electromagnetic waves
    • Ripples on water
    • Waves on strings
    • A slinky spring wiggled up and down
  6. Longitudinal waves have
    • Vibrations along the same line
    • In longitudinal waves the vibrations are parallel to the direction of energy transfer of the wave
  7. Examples of longitudinal waves are
    • Sound waves an ultrasound
    • Shock waves eg seismic waves
    • A slinky spring when you push the end
  8. Transverse , longitudinal or both
    The wave carriers energy from one place to another
  9. Transverse , longitudinal or both
    The substance it travels through does not travel with the the wave
  10. Transverse ,longitudinal or both
    The waves cause regular disturbances
  11. Transverse , longitudinal or both
    The waves causes peaks and troughs in the substance
  12. Transverse , longitudinal or both
    The wave stretches and compresses the substance
  13. The amplitude is the
    Displacement from the rest position to the crest (or trough)
  14. Wavelength is the f
    Full cycle of the wave e.g. from crest to crest
  15. Frequency is t
    The number of complete waves passing a certain point per second or the number of waves produced by a source per second .
  16. Frequencybis measured in
    Hertz (Hz) 1Hz is 1 wave per second
  17. All waves can be
    Reflected refracted or diffracted
  18. Reflection of light lets us
    See things
  19. ReflectionReflection of light is what allows us to see things light bounces off them into our eyes . When light travelling in the same direction reflects from an uneven surface such as a piece of paper , the light
    Reflects off at different angles
  20. When light travelling in the same directionreflects from an even surface (smooth and shiny like a mirror) then it's all
    Reflected at the same angle and you get a clear reflection
  21. What is the normal
    It is an imaginary line that is perpendicular to the surface at the point of incidence (where the light hits the surface)
  22. The law of reflection is
    The angle of incidence = the angle of reflection