Consider all the materials used: two lengths of fiber optic cable, two electronic circuits, a digital oscilloscope, oscilloscope probes, the LED, the photodiode, a ruler to measure length of the short cable, values given

a. What would be the most significant known unknowns affecting your result? These would be uncertainties you already know exist and that you know a value for or could reliably estimate a value for.

b. Whatcould be some unknown unknowns affecting the result? These would be uncertainties you didn't know or realize existed before running the experiment and obtaining your results, or that you would not know how to estimate.

c. Out of the unknown unknowns that have contemplated (realizing their existence now) which could be the most significant one impacting the result?