1.

Radioactive substance has a constant activity of 2000 disintegrations per minute. The material is separated into two fractions, one of which has an initial activity of 1000 disintegration per second while the other fraction decays with t_(1//2) = 24 hours. The total activity in both sample after 48 hours of separation is :

Answer»

1500
1000
1250
2000

Answer :d


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