57Co decays by electron capture.Its half-life is 272 days. The activity left after a year is (if present activity is 2μCi)
0.788μCi
0.431μCi
0.23μCi
0.39μCi
A
0.788μCi
B
0.39μCi
C
0.431μCi
D
0.23μCi
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Solution
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Half life =272days
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