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InterviewSolution
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A radioactive substance has 0.1 gm at a particular instant and has an average life of 1 day . The mass of the substance which decays during the 4th day is give by :A. `6.25 mg`B. `12. 5 mg`C. `3.2 mg`D. `1.25 mg` |
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Answer» Correct Answer - C `[t=(1)/(lambda)=1]`day After 3 days left `w_(1)=wxx e^(-lambdat)` `w_(1)=wxx e^(-3)` After 4 days left `w_(2) =w xx e^(-4)` `w_(1)-w_(2) =we^(-3)=0.1 [ (1)/(e^(3))-(1)/(e^(4))]=3.2 mg ` |
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