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# The t1/2of a radioactive substance is 100sec. Its decay constant is: 6.93×10−3sec−16.93×10−1sec−16.93×10−4sec−16.93×10−2sec−1

A
6.93×102sec1
B
6.93×104sec1
C
6.93×101sec1
D
6.93×103sec1
Solution
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#### t1/2=100 secλ=ln 2t1/2=0.693100=0.00693sec−1

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