Muons are produced through the annihilation of particle a and its anti-particle, namelythe process a + a → µ* + µ¯. A muon has a rest mass of 105 MeV/c² and its proper lifetime is 2us. If the center of mass energy of the collision is 2.1 GeV in the laboratoryframe that coincides with the center-of-mass frame, then the fraction of muons that willdecay before they reach a detector placed 6 km away from the interaction point is(a) e-¹-1(b) 1-e¹(c) 1-e²(d) e-¹0

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