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Homework Help: Power and Speed

  1. Feb 28, 2010 #1
    1. The problem statement, all variables and given/known data
    Every 2km power is reduced by half. Initial power = 10watt. What is power after travelled 8km?

    C = 3x108. What is speed of light passing through optic fibre? n = 1.55

    2. Relevant equations

    P = [tex]\frac{w}{T}[/tex] ?

    3. The attempt at a solution
    I dont know where to start
    Last edited: Mar 1, 2010
  2. jcsd
  3. Feb 28, 2010 #2
    Write a formula relating power and distance..................

    P = 10(2-km/2)
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