1.

The half-life of 1 g of radioactive sample is 9 hour. The radioactive decay obeys first order kinetics. The time required for the original sample to reduce to 0.2 g is

Answer»

15.6 hours
156 hours
20.9 hours
2.09 hours

Solution :`(0.693)/(9) = (2.303)/(t) "LOG" (1)/(1 - 0.2)`


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