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Flashcards

GCSE Core Waves

bronwyn831 Physics GCSE English 33 cards

describe a transverse wave

Cards in this deck (33)

  1. 1all waves transfer... no waves transfer...energy
    matter
  2. 2which waves are part of the electromagnetic spectrum?radio
    micro
    infra red
    visible light
    UV
    gamma
    x rays
  3. 3what is frequency?the number of waves produced/past a point per second. measured in Hertz (Hz)
  4. 4describe a transverse wavedescribe a transverse wavedescribe a transverse wave
  5. 5describe a longitudinal wavedescribe a longitudinal wavedescribe a longitudinal wave
  6. 6What is a transverse wavethe particles move at right angles to the direction the energy movement
  7. 7what is a longitudinal wave?particles oscillate the same direction as the energy transfer
  8. 8what is the wave speed equation?wave speed = frequency x wavelength
  9. 9how do sound waves and light waves diffract?sound- wavelength of metres so diffract through doorways/corners
    light- very small wavelength so diffracts through a tiny gap
  10. 10the angle of incidence and reflection are always...the same
  11. 11—
  12. 12—
  13. 13what makes the light bend?speed increases = angles gets bigger
    speed decreases = angle gets smaller
  14. 14what is the similarity between the rays going into and out of the glass?they are parallel
  15. 15what happens if a light ray hits glass at a 90 degree angle?there is no refraction but the light ray does still slow down
  16. 16what is the critical angle?42 degees
  17. 17explain total internal reflection and give an exampleWhen an incident ray has an angles of or less than 40 degrees it will refract. However if the angle is more than this then the ray will refract internally.
    optical fibres
  18. 18why do light rays refract?because the material they are entering is denser than air what they are coming out of and so the angle of refraction gets smaller as the ray slows down in speed.
  19. 19how do 'cats eyes' in the road work?2 mirrors at 90 degrees to each other reflect light back in the direction that it come from regardless of its angle of incidence
  20. 20describe the characteristics of a sound wavelongitudinal wave- particles move forwards and backwards parallel to the energy
    draw as a transverse wave on an oscilloscope. peak = compression. trough = rarefaction
  21. 21describe these waves1. quiet, low pitch
    2. loud, low pitch
    3. loud, high pitch    describe these waves
  22. 22what is the electromagnetic spectrum lowest to highest frequency?radio
    micro
    infra red
    visible light
    UV
    Xray
    gamma
  23. 23a wave that has a LOW frequency, has a ...... wave length and ..............energy. a wave that has a HIGH frequency, has a ...... wave length and ..............energy.a wave that has a LOW frequency, has a long wave length and low energy.
    a wave that has a HIGH frequency, has a small wave length and high energy.
  24. 24what is visible light, micro, infrared and radio waves used for?visible- photography, optical fibres
    micro- mobile, bluetooth, satellite TV
    infrared- remote controls
    radio- broadcast TV and radio
  25. 25what is the difference between TV and radio signals?TV- shorter radio wave lengths ~ can't diffract round hills very well
    Radio~ larger wave lengths ~ can diffract around hills
  26. 26why are micro waves used for travelling between satellites?shorter than radio waves ~ little difraction
    dont get absorbed by atmosphere
  27. 27How do aerials work?the electrons in the aerial are vibrated using an a.c current. The electrons emit an em. wave with the same frequency as the a.c current.
    When a radio wave hits the aerial it makes the electrons vibrate at the waves frequency = produces same a.c current
  28. 28what are the dangers of infrared, visible, UV, x-ray and gamma rays?infrared- skin burns
    visible- damage to retina from sun or lasers
    UV- skin cancer ~ mutates/kills cells
    xrays and gamma rays- mutates/kills cells
  29. 29what properties do all electromagnetic waves have in common?defract
    reflect
    refract
    travel at same speed
    can't travel through vacum
    transfer energy
    straight lines
  30. 30why cant astronauts hear anything in space?no particles to vibrate and sound cant travel through a vacum
  31. 31What is the doppler effect?wave source moves towards = small wave length, higher frequency (higher pitch)
    waves source moves away = large wave length, lower frequency (lower pitch)
  32. 32What is cosmic micro wave background radiation?the expectation that if the Big Bang Theory is correct, then space would be full of random microwave activity; this can be detected.
  33. 33How does red shift support the Big Bang Theory?if the universe is expanding, everything is moving away ~ longer wave lengths than expected (black lines nearer to red than we expect).
    Bigger the RS = faster the galaxy is moving away
    Blue shift = moving towards

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GCSE Physics Flashcards on GCSE Core Waves, created by bronwyn831 on 01/04/2016.
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