11.07.2015 Views

Mathematics and Society - OS X Lion Server

Mathematics and Society - OS X Lion Server

Mathematics and Society - OS X Lion Server

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Albert A. Michelson (1852 - 1931), America's first Nobel Prize winner in science,made hundreds of measurements of the speed of light. His efforts to establish itsspeed covered a period of 53 years. He's most famous method is shown below.(Ot.-\Al-JTOtJIO35,38G METRESMichelson directed a strong beam oflight onto one face of an octogonalmirror. The light was reflected toanother mirror more than 35 kilometres distant on top of Mt. San Antonio. A sphericalmirror there reflected it back. At the exact moment the light returned the eight-1sided mirror had completed 8 of a revolution. The returning light was reflected intoa receiving unit.(1) What is the total distance in metres the light travels from the time it leaves thelight source until it returns to the receiving unit? __~~~ metresOver many hundreds of trials Michelson's average value for the speed of light was299,796 km/s.Using this value how far would light travel in the following lengths of time?GET READY,GET SET,2) Time 2 sec 5 sec 10 sec 1 min 8 minDistance 1/!light hastraveledinkilometres.(

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