A pion lives 26 ns in its rest frame,but an observer in a laboratory in which the particle moves at a speed of 2.7 $\times$ 10⁸ m/s says the particle lived A)11 ns B)15 ns C)43 ns D)60 ns E)79 ns

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The Answer of A pion lives 26 ns in its rest frame,but an observer in a laboratory in which the particle moves at a speed of 2.7 $\times$ 10⁸ m/s says the particle lived A)11 ns B)15 ns C)43 ns D)60 ns E)79 ns

A Pion Lives 26 Ns in Its Rest Frame,but an Observer