GCSE Physics

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  1. the line joinig the object to the image is at
    right angles to the mirror
  2. the image in the plane mirror is
    laterally inverted
  3. the image in the plane mirror is ....... and the same sizes as the object
  4. the image is as far behind the mirror as
    is in front
  5. ....... are examples of sound being reflected
  6. what is refraction
    it is when rays of light direction when they cross the boundary between two one trasnparent substance and an another
  7. if a light waves hits a bounday face on it : i.e. if the ray meets the boundary ar right angles (along the normal)
    carries on in the same direction i.e. it does not refract
  8. if a wave meets a different medium at an angle the wave
    changes direction - it has been refracted
  9. light travels more slowly in glass , as the light is slowed down it changes direction and is refracted ........ the normal
  10. when light leaves glass , it speeds up and is refracted ...... from the normal
  11. in refrcation the angel of incidence =
    the angel of the emergant ray if the block is rectangular
  12. the angel of inciendence is ..... than the angel of refraction
  13. refraction the incident ray should be ......... to the emergant ray if the block is regtangular
  14. tagaga
    • towards (towards the normal) air -> glass
    • away (from the normal) glass -> air
  15. what happens to the speed of the light ray when it passes from glass to air
    it increases
  16. sound waves travel through solids , liquids , and gases as ...... waves
  17. sound waves travel ..... ... than light waves
    more slowly
  18. sound are produced when
    obejcts vibrate
  19. sound waves ....... travel through a vacuum
  20. the higher the frequency the
    higher the pitch
  21. the bigger the amplitude the
    louder the sound
  22. most children can hear sounds in the range from about
    20 Hz to 20,000 Hz
  23. diffraction happens
    when a wave meets a gap in a barrier or an obstacle , they carry on through the gap , however , the waves spread out to some extent into the area beyond the gap . this is called diffraction
  24. wide gap = ......... diffraction effect
  25. narrow gap = ...... diffraction effect
  26. large wavelength = .....
  27. significant diffraction only occurs when
    the wavelength of the wave is of same size as the width of the gap or size of the obstacle
  28. what doesnt change when a wave is diffracted
    the speed and wavelength of the wave
  29. how many hertz is a kilohertz
  30. how many hertz is a mega hertz
    1,000,000 hertz
  31. how many hertz is a gigahertz
    1,000,000,000 hertz
  32. wave speed is measured in
    metres per second m/s
  33. frequency is measured in
    hertz , Hz
  34. wavelength is measured in
    metres , m

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GCSE Physics
2012-04-29 06:01:52
use waves communication provide evidence that universe expanding

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