Question

1. The life time of muon in the rest frame is 2 x 10"" sec. A beam of muons emerges from a cyclotron with velocity
where c is the velocity of light is 0.8c where c is the velocity of light.The mean life of muons observed in the laboratory frame will be
(A) 0.25 x 10-sec
(B) 0.3 x 10-6 sec
(C) 3.3 * 10-sec
(D) 4.2 x 10-0 sec
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Answer 1

Answer : According to me the answer should be 0.3 * 10-6 sec. B part