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EECS230 Lab 5 - December 4th EECS230 Lab 5 Written Report...

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EECS230 Lab 5 December 4 th Written  Report Jordan Adams 96737113
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Experiment 1: Measuring the Speed of Light Measured Data: Delay:  122 (ns) Analysis: 1. Using the delay time and the length of the optical fiber. Compute the propagation  velocity u p , for the optical fiber.  Record the value. Length of optical fiber = 20cm Delay 122 ns u p = length / delay = 20cm/122ns = 1.64 x 10 6 2. Assuming   = 2.225 for the plastic fiber, compute the speed of light in free space, c.  Record this value. U p = c/    Solve for c. c=u p *  = 1.64 x 10 * (2.255) 1/2  =2.5 x 10 8  (m/s) 3. Compute the percent error in your measurement of the speed of light in free space (take  the theoretical value of c to be 3 x 10 8   m/s) and comment on your results. Percent error = (|theoretical – experimental|/theoretical)*100           = (3.0x10 8 -2.5x10 8 )/(3.0x10 8 )*100 = 16.6% The measured value was off by 16.6 percent.  This could have been due to  measurement error in the delay time.   Questions:
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1. When you calibrated the speed of light apparatus, you adjusted the delay value.  What  does this added delay represent? (Hint: What are you compensating for assuming the  travel time through the 15 cm fiber is small enough to ignore?) When the speed of light apparatus was being calibrated the delay value had to be  adjusted.  This added delay was used so that the received signal could be matched up 
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