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Flashcards

Science Physics 2 y8

mansi M English 83 cards

Cards in this deck (83)

  1. 1What kind of surfaces are better and worse at reflecting light?Light, smooth shiny coloured objects are better at reflecting light than dark dull objects
  2. 2what is the rule of reflection all about?when light is shined at an angle, it'll boince back at the same abgke on the opposite side
  3. 3what are you shing the light along if you shine it straight?the normal (imaginary line)
  4. 4what is the angle that the light makes when it hits the mirror first called?the angle of incidence
  5. 5what is the angle that the angle makes when it bounces back calledthe angle of reflection
  6. 6draw the image of reflection.
  7. 7what is scattering in reflectionthe rule of reflection only occurs on smooth surfaces so rough surfaces will reflect light in different directions, called scattering
  8. 8simplify tje rule of reflectionthe angle of incidence = the angle of reflection
  9. 9what is the basic reason of why you see thingsbecause lightwaves shine out from a light source , then bounce off different objects, and then enter the eye
  10. 10why cant you see around corners?because light waves only travel in straight lines
  11. 11how is white light made in a prism?when the spectrum of one prism passes through
    a second prism, the colours recombine to make white light
  12. 12what are the 3 primary colours?red green blue
  13. 13what are the 3 secondary colours?yellow magenta and cyan
  14. 14how is white light madeby mixing all the primary and secondary colours together
  15. 15how is black light made?when all the colours are absorbed
  16. 16Fill in a table with the colours made and absorbed etc.
  17. 17how is a rainbow madewhen all the different colours are sepearted by water (rain)
  18. 18how do colours spread outwhen each colour hits a transparent object, it moves at a slughtly different speed. this makes it spread
  19. 19why do shiny objects look bright?because they reflect lots of light back
  20. 20why did the light refract in the prism?because light moves quick in air, but it gets slower because of the less dense air in the glass
  21. 21why does light refract the normal?due to more dense air in the glass, but when when it hits less dense air, it moves away from the normal
  22. 22what is the normal?an imaginary line, that id normally 90 degrees
  23. 23what colours make a white light?Red orange yellow green blue indigo violet (ROYGBIV)
  24. 24what is ultrasound?soundwaves with frequencies higher than 20,000Hz
  25. 25what is a sonogramdetecting a baby feotus inside a womb, safely
  26. 26how does a sonogram work?when high frequency soundwaves are passed into the womb, they bounce back from the baby feotus
  27. 27give 3 examples of uses of ultrasound1. checking a baby feotuses health status
    2. medical treatment of kidney stones
    3. diagnose any diseases
  28. 28what two animals use ultrasoundbats and dolphins
  29. 29what are the comparisons in a xray and ultrasound?x rays have a much shorter wavelength compared to ultrasound
  30. 30how is sound produced?when things vibrate
  31. 31how do we hear thingsvibrations pass through tye air in a continuous wave. Then vibrations reach your eardrum making them vibrate too, till you hear the noise
  32. 32why are some sounds high pitchedwhen something vibrates fast, the waves sent move fast too
  33. 33what are high frequency sound waveswhen something vibrates very fast
  34. 34what are the waves called when something vibrates slowlylow frequency sound waves
  35. 35which frequency makes high pitched noiseshigh frequency
  36. 36what is wavelength measured inHz (Hertz)
  37. 37what is infrasoundsoundwaves below 20Hz
  38. 38how can you 'see' a sound wave?using an oscilloscope
  39. 39what does amplitude meanhow loud something is
  40. 40how does amplitude work?the taller the peaks on the wave, the louder the sound
  41. 41how does frequency workthe more peaks there are, the higher the pitch of sound
  42. 42draw a louder, more high pitched wave.
  43. 43what does a bigger wavelength meana deeper pitch
  44. 44what is a wavelength mean OVERALLThe Type Of Pitch
  45. 45what is the top of a wave calledpeak or crest
  46. 46what is the bottom of a wave calledtrough
  47. 47what does amplitude mean overallthe dustance between the middle and the peak
  48. 48what ELSE does frequency meanhow many waves pass per second
  49. 49Labell an eye, FULLY..
  50. 50How does it work briefly?when light hits the lens in your eye, it is refracted. This makes the image upside down, but the brain flips it around
  51. 51give 5 steps to observing1. Light rays bounce of objects in all directions
    2. some rays enter through the pupil
    3. lens focus rays into the retina upside down, as the rays are refracted
    4. receprors in the retina convert the rays into sugnals.
    5. he sinals travel to the brain through the optic nerve
  52. 52draw and labell a daigram of the eat fully.
  53. 53what does the eardrum dovibrates when soundwaves reach it
  54. 54what does the auditory nerve docarries nerve impulses from cochlea to brain
  55. 55what does middle ear bone docarries vibrations from ear drum to cochlea
  56. 56what do the semi circular canals dodetect any movement
    have sensory hairs and fluids
  57. 57what does cochlea docontains cells that are sensitive to sound vibrations.
    It also changes sound vibrations into nerve impulses
  58. 58how do bats use ech location?they make high pitched clicks and listen to the echoes
  59. 59what are echoesreflected sound waves
  60. 60what is the best place to hear echoes (4)hard, flat, solid, surfaces that are far away
  61. 61where fo shadows come fromopaque objects cast shadows because light cannot pass through them. infact, they absorb light, which leaves a black area behind the object
  62. 62what does refraction meanwhen the light slows down or speeds up and then bends
  63. 63give 4 examples of objects containing lensglasses
    telescopes
    microscopes
    cameras
  64. 64how does a lens workit focuses light waves by refracting the light entering it
  65. 65wgat are the 2 main types of lensesconcave abd convex
  66. 66what is a concave, and what is a convexConvave - refracts light outwards
    Convex - refracts light inwards
  67. 67how do your eyes focus on things easily?by making the lens change shape
  68. 68why do some people wear glasses?because their lenses dont change shape easily
  69. 69what else can light waves travel througha vacuum
  70. 70what type of wave is a light wave?Transverse
  71. 71what type of wave is a sound wave?Longitudinal
  72. 72can light and sound waves travel through sokds liquids and gases?yes
  73. 73how is a light wave detectedthrough an eye and camera
  74. 74how is a sound wave detectedby ears and microphones
  75. 75what is dispersionwhen the differnt wavelengths spread out
  76. 76what is a camera?a device that focuses from objects onto a photo sensitive material, using lens
  77. 77draw and label a picture of a camera.
  78. 78at how many Decibels can soneone get permanent ear damage?85 decibels
  79. 79How can ultrasound be used to detect objects in air and water?Speed × Time = distance
  80. 80What is yhe speed of sound in air?334 metres per second
  81. 81What is the speed of sound in water1530 metres per second
  82. 82When do you need to half the values?When it is the time taken to travel FROM THERE AND BACK
  83. 83When is the angle of refraction bigger than the angle of incidence?When light speeds up as it passes from one material to another

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Flashcards on Science Physics 2 y8, created by mansi M on 16/06/2017.
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mansi M
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