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Question

# 57Co decays by electron capture. Its half life is 272 days. Find the activity left after a year if present activity is 2μCi0.39 μ Cinone of these0.788 μ Ci0.431 μ Ci

A
none of these
B
0.39 μ Ci
C
0.788 μ Ci
D
0.431 μ Ci
Solution
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#### λ = 0.693t1/2 = 2.95×10−8s−1

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