Answer to Question #35837 in Electric Circuits for moses
N=N0 * (1/2)^(t/tau)
where N0 is initial quantity of isotope and tau is half-life.
so we find
N/N0 = (1/2)^(t/tau) = (1/2)^(1/2) = 0.71
Answer is d. 0.71
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