After 280 days, the activity of radioactive sample is 6000 disintegration per second. The
activity reduces to 3000 disintegration per second after an-other 140 days. The initial activity of the sample in disintegration per second is
A) 6000
C) 3000
B) 9000
D) 24000
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c
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Answer:
9000 will be the right answer.....
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