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Karteikarten

Waves

sebi2899 Physics AS - Level Englisch 44 Karten

Karten in diesem Stapel (44)

  1. 1What is a Transverse wave?Waves in which the direction of vibration is perpendicular to the direction in which the waves travels
  2. 2What is a longitudinal wave?Waves in which the direction of vibration is parallel to the direction in which the wave travels
  3. 3What type of waves can be polarised?Transverse waves
  4. 4What is the displacement of a wave?Is its distance from the equilibrium position
  5. 5What is the amplitude of a wave?The maximum displacement of a vibrating particle
  6. 6What is a period of a wave?The time for one complete wave
  7. 7What is the 'Phase difference' between two particles?The fraction of cycle
  8. 8What is superposition?When two waves meet they will 'superimpose'
  9. 9What type of superposition will two crests form?Constructive
  10. 10What type of superposition will a crest and trough form?Zero displacement, Destructive
  11. 11What is a Coherent source?Waves have the same frequency and wavelength annd have a constant phase difference
  12. 12What is interference?When two waves superimpose
  13. 13What are nodes?Points of zero displacement
  14. 14When do nodes occur?When two waves are 180 degrees out of phase
  15. 15What are antinodes?Points of maximum displacement
  16. 16When do antinodes occur?When waves are in phase
  17. 17When waves have different amplitudes, what will it causeTotal cancellation cannot occur
  18. 18What are stationary waves?Are produced when two progressive waves pass through each other
  19. 19What is the first stationary wave pattern called?First harmonic
  20. 20What is the distance between nodes?Half a wavelength
  21. 21Do stationary waves transfer energy?They don't transfer energy
  22. 22Why does refraction occur?It occurs because the speed of the light waves is different in each material
  23. 23What happens to the light ray if it goes into a material that is more refractive?Bends towards the normal
    Visa versa
  24. 24What does a greater refractive index cause?Slows down the light
  25. 25How does refraction effect frequency of a wave?It doesn't
  26. 26What happens if the angle of incidence is the same as the critical angle?The light will follow the boundary
  27. 27What happens if the angle of incidence is greater than the critical angle?Total internal reflection
  28. 28What is partial internal reflection?When the angle of incidence is less than or equal to the critical angle
  29. 29What is diffraction?The spreading out of waves as they pass through a gap
  30. 30What happens to the diffraction when the gap is bigger?The diffraction pattern is less spread out, narrower central maxima, and more intense central maxima
  31. 31What happens to the diffraction when the gap is Smaller?The diffraction pattern is more spread out, wider central maxima, and less intense central maxima
  32. 32What happens to the diffraction when the wavelength is increased?The diffraction pattern is more spread out,
    wider central maxima, and less intense central maxima
  33. 33Describe the diffraction patternA central fringe, and dimmer smaller fringes
  34. 34What is the size comparison of fringes?The central fringe is twice the size of smaller fringes
  35. 35What increases the angle between the fringes?Wavelength is increased
    Closer spaced slits
  36. 36What is laser light?A Coherent source
  37. 37What must two light sources be for interference to occur?Coherent and monochromatic light
  38. 38What is monochromatic light?Light of a single wavelength
  39. 39Single slit using white lightCentral white fringe
    Fringes with a spectre of colours, red on the outside and blue on the inside
  40. 40Difference of pattern created by single slit between white light and laserWhite light:
    1) Has different colours
    2) less intense
    3) maxima wider/minima narrower
    4)max and min closer together
  41. 41What does absorption in an optical cable cause?Amplitude being reduced
  42. 42What does dispersion in an optical cable cause?Pulse broadening
  43. 43Two types of dispersion?Modal dispersion - The rays enter at different angles, so will take different paths
    Material dispersion - Light used has different wavelengths, so travels at different speeds down the fibre
  44. 44Why are optical repeaters used?To clear the signal as it is affected by absorption and dispersion

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AS - Level Physics (Waves) Karteikarten am Waves, erstellt von sebi2899 am 15/03/2016.
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