Question

4
A particle has total energy of 315 MeV. If in its rest frame, particle has mass of
105 MeV/c2 and life time of 2.2 us. Find the velocity of the particle with which it
is moving, observed life time of the particle and distance traversed by the particle
before decaying
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Answer 1

If ajan ahankar se bachen jisse yeh hai mamala samne aaya hai jab vah ek din bad bhi koi bhi nahin kar sakta hun aur main apne ghar