Half life of 10 gm of radioactive substance is 10 days . The half life of 20 gm is
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20 days is the half life of 20gm radioactive substance
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Radioactive decay always follows first order kinetics.
In first order kinetics, the half life is independent of the initial amount of substance taken.
It so follows that the half life of the substance will be the same IRRESPECTIVE of the amount taken initially.
Therefore the half life of 20 gm of radioactive substance, in this case, is also 10 days.
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