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Speed of Light

  1. Jan 15, 2008 #1
    The speed of light is 3.00 x 108 m/s. How many miles will light travel in 19.8 µs? (One mile is 1.61 km.)

    I don't even know where to start, any help would be appreciated.
     
  2. jcsd
  3. Jan 15, 2008 #2

    Doc Al

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    Staff: Mentor

    What's the definition of speed?
     
  4. Jan 15, 2008 #3
    anyone? help!!
     
  5. Jan 15, 2008 #4

    Doc Al

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    Staff: Mentor

    Again: What does speed mean? (Hint: The units are meters/second.) How does speed relate to distance and time?
     
  6. Jan 15, 2008 #5
    speed is - distance/time
     
  7. Jan 15, 2008 #6

    Doc Al

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    Exactly! So distance = speed X time.

    Use that to find out how many meters the light travels in that time. Then convert that answer to miles.
     
  8. Jan 15, 2008 #7
    thanks for your help doc, was easy enough :)
     
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