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After 280 days, the activity of a radioa...

After `280` days, the activity of a radioactive sample is `6000` dps. The activity reduces to `3000` dps after another `140` days. The initial activity of the sample in dps is

A

6000

B

9000

C

3000

D

24000

Text Solution

Verified by Experts

The correct Answer is:
D
`T_(1//2) = 140` days
`N/(N_(0))=(1/2)^(t//T_(1//2)) rArr 6000/(N_(0))= 280 /140 (1/2)`
`rArr N_(0) = 24000` dps .
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