Radioactive substance has a constant act...

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 :

1500

1000

1250

2000

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