** The half –life of a radioactive substance is 30 s. Calculate: **

** (i ) the decay constant, and **

** (ii) Time taken by the sample to decay 3/4 of its initial value. **

** The half –life of a radioactive substance is 30 s. Calculate: **

** (i ) the decay constant, and **

** (ii) Time taken by the sample to decay 3/4 of its initial value. **

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