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Unformatted text preview: Ph 214, Spring 2008 Exam # 2 Question #1 Name: (no name, no score!) 1. Short answer questions [20 pts] Answer all three questions and try to limit yourself to the space provided. Make minimal use of equations and explain clearly. If you need extra space, use page # 3 and clearly identify which part you are answering. (a) [5 pts] Spacetime events The spacetime coordinates (as observed in the ground frame) for three pairs of events ( A 1 ,A 2) , ( B 1 ,B 2) & ( C 1 ,C 2) are shown in the figure at right. Is it possible to find a frame moving with velocity v relative to the ground in which one of these pairs of events is observed to take place at the same location? If so, for which pair and what is the velocity of this frame relative to the ground? (b) [5 pts] Photon Decay Is it possible for a single photon to decay into a pair of identical massive particles? Explain. 1 Ph 214, Spring 2008 Exam # 2 Question #1 Name: (no name, no score!) (c) [10 pts] Modified Michelson Interferometer The upper figure at right shows the standard configuration of a Michelson interferometer with arms of equal length L . An engineer wants to use this device to measure the index of refraction n of an un- known liquid. The liquid completely fills a transparent container of length d ( L > d ). Using monochromatic light of wavelength , the engineer first measures the fringe pattern with the standard configuration. The liquid is then inserted along one arm of the in- terferometer (lower figure) and a new fringe pattern is measured....
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- Spring '08