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The half life of a first order reaction is 10 minutes. If initial amount is 0.08 mole/litre and concentration at some instant ‘t’ is 0.01 mol/litre, then the value of ‘t’ is :

The half life of a certain radio isotope is 10 minutes. The number of radioactive nuclei at a given instant of time is 10^(8) Then the number of radioactive nuclei left 5 minutes later would be:

A radioactive element has rate of disintegration 10,000 disintegrations per minute at a particular instant. After four minutes it becomes 2500 disintegrations per minute. The decay constant per minute is