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Power and Speed

  • Thread starter reallydumb
  • Start date
  • #1

Homework Statement


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


Homework Equations



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



The Attempt at a Solution


I dont know where to start
 
Last edited:

Answers and Replies

  • #2
324
0
Write a formula relating power and distance..................


P = 10(2-km/2)
 

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