PHYS171_f11_lecture_46

PHYS171_f11_lecture_46 - PHYS171 Special relativity...

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1 PHYS171 Special relativity Michelson-Morley experiment Beam is split and follows two different paths. The delay of one path with respect to the other is measured. ether wind. v No Difference is found for two paths! Light travels at the same speed regardless of ether “wind.”
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2 Special relativity Simultaneity A B A’ B’ O O’ A and B are configured to emit flashes of light. A and A’ both flash when they are at the same position, same for B and B’. Simultaneity of A with A’, B with B’ are clear because they are at the same location when they flash. Observer O considers flashes from A, B to be simultaneous because they are equidistant and flashes arrive at the same time. What will O’ observe? v Special relativity Simultaneity A B A’ B’ O O’ Observer O says light from B’ will reach observer O’ first, because she has moved towards B. Observer O’ says light from B’ will reaches her first. From her point of view B’ flashed first, then A’, and since A is simultaneous with A’ and B with B’, B
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This note was uploaded on 12/29/2011 for the course PHYSICS 171 taught by Professor La porta during the Fall '11 term at Maryland.

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PHYS171_f11_lecture_46 - PHYS171 Special relativity...

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