1.

Half-life for certain radioactive element is 5 min. Four nuclei of that element are observed at a certain instant of time. After 5 minutes STATEMENT-I: It can be definitely said that two nuclei will be left undecayed. STATEMENT-II: After half-life that is 5 minutes, half of totan nuclei will disintegrate. So, only two nuclei will be left undecayed.

Answer»


SOLUTION :Calculation is applicable on the LARGE AMOUNT of ratio active SUBSTANCE and it is propable.


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