01 how does light travel

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We can't see without light, light is all around us. Light travels faster than sound

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01 how does light travel

  1. 1. Where is there light in this room? Light is all around us. Make a new title page: Light and Sound
  2. 2. How does light travel? <ul><li>Learning Objectives : </li></ul><ul><li>To understand that light travels from a source. </li></ul><ul><li>To know that light travels at a very high speed, much faster than sound. </li></ul>
  3. 3. Task <ul><li>Draw some lightning then try to explain which comes first, the clap of thunder or the flash of lightning? </li></ul><ul><li>Why does one come before the other? </li></ul><ul><li>What happens if you move further away from the storm? </li></ul>
  4. 4. Light travels much faster than sound. For example: <ul><li>Thunder and lightning start at the same time, but we will see the lightning first. </li></ul>2) When a starting pistol is fired we see the smoke first and then hear the bang.
  5. 5. Light travels VERY FAST – around 300,000 kilometres per second. At this speed it can go around the world 8 times in one second.
  6. 6. 8K Light shifts 1 the Sun 2 Pluto 3 the Moon 4 the nearest star other than the Sun 5 a computer screen on your desk A almost instantly B 1.3 seconds C 10 hours D 8.5 minutes E 4 years How long does light take to reach us from... D 8.5 minutes C 10 hours B 1.3 seconds E 4 years A almost instantly
  7. 7. How light travels <ul><li>Do Experiment A and B </li></ul><ul><li>Remember the aim is to try and shine light on the board at the end! </li></ul><ul><li>How do you know that light travels in a straight line </li></ul><ul><ul><li>Write a conclusion from each of the experiments that explains this </li></ul></ul>
  8. 8. Investigating how light travels? <ul><li>How can you get the light to shine on the card? What does this tell you about the way light travels? </li></ul>
  9. 9. <ul><li>How did you get the light to shine on the white card? What does this tell you about the way light travels? </li></ul>Investigating how light travels?
  10. 15. Explain what you have seen <ul><li>Light travels in straight lines: </li></ul>Laser
  11. 16. Drawing light waves <ul><li>Light travels in straight lines </li></ul><ul><li>We can represent a ray of light using a straight line with an arrow to show the direction of travel </li></ul><ul><li>Draw diagrams of today’s investigations using light rays </li></ul>
  12. 17. <ul><li>Light carries energy and travels as a wave. </li></ul><ul><li>Light travels at 300 000 000 m/s or 300 000 km/s (much faster than sound). </li></ul><ul><li>Light waves travel in straight lines. </li></ul>Summary
  13. 18. How does light travel? <ul><li>Learning Objectives : </li></ul><ul><li>To understand that light travels from a source. </li></ul><ul><li>To know that light travels at a very high speed, much faster than sound. </li></ul>

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