Observer A, who is at rest in the laboratory, is study-ing a particle that is moving through the laboratory at aspeed of 0.624c and determines its lifetime to be 159 ns.(a) Observer A places markers in the laboratory at thelocations where the particle is produced and where itdecays. How far apart are those markers in the labo-ratory? (b) Observer B, who is traveling parallel to theparticle at a speed of 0.624c, observes the particle to beat rest and measures its lifetime to be 124 ns. Accord-ing to B, how far apart are the two markers in thelaboratory?

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