The half -life of a radioactive nucleus ...

The half -life of a radioactive nucleus is 50 days. What is the time interval `(t_2-t_1)` between the time `t_2` when `2/3` of it has decayed and the time `t_1` when `1/3` of it had decayed ?

30 days

50 days

60 days

15 days

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