Question
The S.I. unit of radioactivity is
- Roentgen
- Rutherford
- Curie
- Becquerel
The correct answer is: Becquerel
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If half life of a radioactive element is , after its activity becomes
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After 280 days, the activity of a radioactive sample is 6000 dps. The activity reduces to 3000dps after another 140 days. The initial activity of the sample(in ) is
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and 
reacts to produce
