b) If a modern, high-precision Michelson-Morley experiment could be created so that one arm of the apparatus was aligned parallel to the predicted aether, how long would the distance between the beam splitter and the reflective mirrors need to be so that the time difference between arriving pulses was 3 fs? (Note that 1 fs = 1 x 10-15 s and the Earth has an expected velocity of 3 x 104 m/s through the aether) [20] c) From your answer to (b) above, calculate the predicted path length difference that would be expected, and give this answer in nm. [10]