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The rate of disintegration of a radioactive substance falls from 800 `decay//min` to 100 `decay//min` in 6 hourse. The half life of the radioactive su

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The rate of disintegration of a radioactive substance falls from 800 `decay//min` to 100 `decay//min` in 6 hourse. The half life of the radioactive substance is :
A. `6//7`
B. 2 hrs
C. 3 hrs
D. 1 hr
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Correct Answer - B
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