Question

Problem 5: An experiment is created to accurately measure the speed of light by creating a very, very long tube, placing a mirror at one end, and pumping out all of the air to create a vacuum. A laser is then fired from the end opposite the mirror and the time it takes for the laser to make a round trip is measured. The first attempt yields a value of 0.68|1s. It is later discovered that an air leak at the far end blew the mirror up the pipe towards the laser, creating a tube much shorter than expected. Based on the estimate for the speed of light given on the equation sheet, how far away is the mirror from the laser now? A 0.08km B 0.10km C 1.98km D 3.32km E None of these.

Answer 1

LASER distance travel = 2L time taken a t= 0.68 x 10 sec Velocity of light = 3x108 m/s 2 L = 22 = 68 V X + 3x100 x 0.68 x 106 => L = 204 = 102 m L = 102 x103 km L = 0.102 km

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