GoConqr hat ein neues Design! Sag uns, wie es dir gefällt.

Kostenlos registrieren

Karteikarten

Physics - Waves

Jade Potter-Goddard Science GCSE Englisch 100 Karten

Karten in diesem Stapel (100)

  1. 1What is the frequency?How many waves in one second.
  2. 2What is the wavelength?The disatnce from peak to peak on a wave.
  3. 3What is the amplitude?The height of a wave above the zero line.
  4. 4What can we use waves for?To transfer information and energy.
  5. 5What are mechanical waves and give 3 examples?They're waves that are vibrations that travel through a medium. (Sound waves, water waves and waves on springs and ropes.)
  6. 6What are electromagnetic waves and give 3 examples of them?Waves that can travel through a vaccum at 300,000 kp/s with no medium required. Microwaves, radio waves and light waves.
  7. 7Name 2 types of waves?Longitudinal and Transverse.
  8. 8What does a picture of a longitudinal wave look like?They have a shorter wavelength with compressions.
  9. 9What does a picture of transverse wave look like?A 'regular wave' diagram.
  10. 10Give an example of a transverse wave.Sound.
  11. 11Give an example of a longitudinal wave.Light.
  12. 12What is the difference in the direction of motion of particles between the two waves?Transverse waves travel perpendicular to the direction of the waves however longitudinal.
  13. 13What is the difference in the way that the two types of waves can travel?Transverse waves can travel through a vaccum but longitudinal waves can't.
  14. 14When is 1Hz measured?When one wave crest passes each second.
  15. 15How else can the wave speed be asked?By how fast an object/person moves.
  16. 16What is the angle of incidence?The angle the ray of light makes with the norm.
  17. 17What is the angle of reflection?The angle the reflected ray makes with the normal.
  18. 18True or False: The angle of incidence is always equal to the angle of reflection?True.
  19. 19What is it called when you write as you see words in a mirror?Laterlly inverted.
  20. 20What is a plane mirror?A normal, flat mirror.
  21. 21What does laterally inverted mean?Left is right and right is left.
  22. 22What 5 things will an object always be in a plane mirror?- Upright.
    - Same size as the object.
    - Distance from the mirror to object is equal to the distance from image to mirror.
    - Laterally inverted.
    - Virtual.
  23. 23What must the normal be?Perpendicular to the plane mirror.
  24. 24What does the speed of light waves depend on?The material they are travelling through.
  25. 25What happens as the angle of incidence increases?So does the angle of refraction.
  26. 26Which way will the ray of light bend as it enters a denser medium?Towards the normal.
  27. 27Which direction does the ray of light bend when it enters a less dense medium?It creates an equal angle of incidence and goes back to it's original shape.
  28. 28Define Density.How tightly packed together the atoms are in a particular material.
  29. 29Why does refraction form this shape?Because of the light slowing down and changing direction when it reaches a denser medium and because of the light getting faster and going back to it's an original shape once it reaches the original density.
  30. 30What happens when a single ray of white light is refracted by a triangular glass prism?Each spectrum of the rainbow is refracted as seperate rays of light because each colour is refracted slightly differently.
  31. 31When does maximum diffraction take place?When the gap is the same size as the wave length.
  32. 32What causes the waves to spread out more?The gap they diffract through increasing.
  33. 33How to get full marks when describing how houses etc. gain signal via diffraction. (3)- The waves are initially in a straight line.
    - They hit an obstacle.
    - Which causes the waves to diffract.
  34. 34What is diffraction?The spreading of waves when they pass through a gap or move past an obstacle.
  35. 35Give 2 examples of diffraction?1. Diffraction of light. - Longitudinal. (Little diffraction means that the Hubble Space Telescope can recieve very clear images.)
    2. Diffraction of ultrasonic waves. - Transverse. (Used in ultrasonic scans: emits the waves and then refract from the tisue boundries inside the womb.)
  36. 36Why can people in hill dense areas sometimes have poor signal?The radio waves pass over the hill and diffract however they don't spread out enough behind the hill and so they can't reach the houses.
  37. 37What is the exact speed of sound in air?340m/s.
  38. 38What 3 states can sound waves only travel in? Why?Liquid, gas & solid because there must be particles.
  39. 39What is the relationship between density and how easy it is for sound waves to travel? Why?The denser the object the easier it is for sound to pass through it because there are more particles.
  40. 40What 5 things should you include when explaining why sounds can be heard further way in denser mediums?1. Denser means that the particles are closer together.
    2. This means that there is less distance for it to travel which means that it can travel further.
    3. Sound is caused by vibrations.
    4. This makes the particles bump into each other.
    5. This makes a wave which travels to her ear.
  41. 41What is an echo?When sounds reflect off of bare walls.
  42. 42Why aren't echos heard with fabric walls?Because the fabric absorbs the sound.
  43. 43Why aren't echos heard on uneven walls?Because the sound waves are reflected broken up and scattered.
  44. 44What is the relationship between temperature and the speed of sound?The warmer the air, the faster the speed of sound.
  45. 45Why do sound waves refract upwards during daytime?Because the air lower to the ground is warmer than the air higher above it.
  46. 46What is the advantage of sound refracting downwards?The sound waves travel further.
  47. 47What happens to the sound waves in music?They change smoothly and the wave pattern often repeats.
  48. 48How can you tell if a sound is loud?The wave on an oscilloscope will have a large amplitude.
  49. 49How can you tell if a sound is high-pitched?The frequency will increase.
  50. 50What is the order of the electromagnetic spectrum from smallest frequency/largest wavelength?- Radio Waves
    - Micro Waves
    - Infra-Red Radiation
    - Visible Light
    - Ultra Violet
    - X-Rays
    - Gamma Rays
  51. 51What speed to all the waves in the electromagnetic spectrum travel at?300,000,000 m/s.
  52. 52What are the uses for radio waves? (3)- Communication (Phones)
    - TVs
    - Radios
  53. 53True or False: Radio Waves are safe?True.
  54. 54True or False: Microwaves can travel through bricks etc.?True.
  55. 55What uses are there for microwaves? (3)- Mobile Phones
    - Satellites
    - Cooking
  56. 56What are the dangers of Microwaves?Health implications if too close to head.
  57. 57What is Infrared Radiation used for? (3)- Heaters
    - TV Remote
    - Night Vision
  58. 58What are the dangers of Infrared Radiation? (1)Burns.
  59. 59What are the uses of Ultra-Violet? (2)- UV tanning lamps.
    - Fluorescent Tubes.
  60. 60What are the dangers of Ultra-Violet? (3)- Eye harm.
    - Skin cancer.
    - Sunburn & blistering.
  61. 61What are the uses of Visible Light? (2)- Communication.
    - Lighting.
  62. 62What are the dangers of Visible Light? (2)- Damage to eyes.
    - Gets very hot.
  63. 63What are the uses of X-Rays? (2) How/Why?- To check bones.
    - To check internal structures of objects.
    Because they can pass easily through soft body tissue but not bones.
  64. 64What is a danger of over exposure to X-Rays?- Cancer
  65. 65What is good about the way Gamma Rays work?They pass through all materials with ease except the densest.
  66. 66What are the uses of Gamma Rays? (2)- Sterilizing equipment and food.
    - Radiotherapy.
  67. 67What is the danger of Gamma Rays?- Can penetrate the skin which damages cells.
  68. 68What is the definition of electromagnetic waves?Electric and magnetic disturbances that transfer energy from one place to another.
  69. 69What is the relationship between energy and frequency?The higher the frequency, the higher the energy.
  70. 70In terms of Infrared Radiation; what happens the hotter something gets?The amount of infrared radiation increases.
  71. 71Why can we use microwaves for satellite TV?Because they can break through the atmosphere.
  72. 72Why are microwaves good for beaming signals from one place to another?Because they don't spread out as much as radio waves.
  73. 73What can Radio Waves replace? An example?Cables. Eg. Bluetooth.
  74. 74How has satellite TV improved watching TV? Why? (2)They don't have to diffract around objects like radio waves making a stronger signal and they're more direct. This is because microwaves come from the sky.
  75. 75How do fibre optics work?Energy is turned into light and is sent through underground wired to the modem at the speed of light.
  76. 76Define total internal reflection.Shining light at the right angle so that it completely reflects.
  77. 77How often does fibre optic have to be boosted?Every couple of hundred miles.
  78. 782 benefits of fibre optics?- No signal degradation.
    - Goes very fast.
  79. 79The negative of fibre optics?Very hard to repair.
  80. 80What do shorter wavelengths mean? (3)- The more information they carry.
    - The shorter their range. (increasing atmosphere absorption.)
    - Less they spread out. (Less diffraction.)
  81. 81What are smallest radio length used for? Why?TV Broadcasting/Masts because they're the best for carrying information.
  82. 82What are radio wavelengths from 1m to 100m used for? Why?Local radio stations and emergency services because their range is limited to the area around the transmitter.
  83. 83What are radio wavelengths over 100m used for? Why?National and international radio stations because they have a much larger range.
  84. 84What are optical fibres and what stops the light from escaping?Very thin glass fibres and so the light reflects off of the walls meaning that the signals stay in the fibre and none are lost.
  85. 85What is the Doppler effect?The change in the observed wavelength (and frequency) of waves due to the motion of the source of waves.
  86. 86What happens if the source of the wave come towards you?The waves increase in frequency and decrease in wave length and so the sound would seem higher/the light may appear to be violet.
  87. 87What causes the frequency of a wave to increase?The waves compress.
  88. 88What would happen s the source of wave moves away?The frequency of the wave would lower in frequency/increase in wavelength and so it would seem a deeper sound/could appear as a red light.
  89. 89What would happen is you were inside the source of wave?It would all remain at one frequency and not change.
  90. 90What would happen if the source of wave was travelling faster?The frequency would increase because the waves are moving past faster.
  91. 91What is Red Shift?Light from other galaxies appearing more red than they are.
  92. 92Why is it called Red Shift?The light waves are stretched out if a star or galaxy is moving away from us which increases the wave length which makes the spectrum of light shift to the red part.
  93. 93What is Blue Shift?When the opposite happens the wavelength as a star or planet moves towards us.
  94. 94What was discovered in 1929? (2)- The light from distant galaxies was red-shifted.
    - The further a galaxy is; the bigger its re-shift is.
  95. 95This means that? (2)- The distant galaxies are moving away from us.
    - The greater distance a galaxy is from us; the greater the speed that it moves away from us.
  96. 96Which concludes that?The universe is expanding.
  97. 97Describe the 3 steps of the big bang theory?1. It started as a extremely small singularity which rapidly expanded; releasing dense energy.
    2. This energy began to turn into matter.
    3. The matter gradually began to form the stars and planets.
  98. 98How is Red-Shift evidence for the big bang?It shows that the galaxies are moving away from us.
  99. 99How is cosmo microwave background radiation evidence of the big bang?The presence of it shows that the universe is expanding because when it does it cools which caused the detectable microwaves.
  100. 100What should scientists do if a theory is not supported by new data? (2)- Check reliability & accuracy.
    - Come up with a new theory.

Informationen

Beschreibung
Unleash a world of possibilities with ExamTime's Flashcard Maker.
Aufrufe
0
Verlauf
  • Erstellt von maya velasquez · 31 Mär 2016
  • Kopiert von Andrea Leyden · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
  • Kopiert von Jade Potter-Goddard · 31 Mär 2016
Bewertung

Feedback

Worum geht es?

Wie gefällt dir das neue Design?

Dein Eindruck