The half-life of 1 gm of radioactive sample is 9 hours. The radioactive decay obeys first order kinetics. The time required for the original sample to reduce to 0.2 gm is [AMU (Engg.) 2002]

The half-life of 1 gm of radioactive sample is 9 hours. The radioactiv

1.	The half-life of 1 gm of radioactive sample is 9 hours. The radioactive decay obeys first order kinetics. The time required for the original sample to reduce to 0.2 gm is [AMU (Engg.) 2002]
A.	15.6 hours
B.	156 hours
C.	20.9 hours
D.	2.09 hours
Answer» D. 2.09 hours

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The half-life of 1 gm of radioactive sample is 9 hours. The radioactive decay obeys first order kinetics. The time required for the original sample to reduce to 0.2 gm is [AMU (Engg.) 2002]

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