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  4. A substance has a half life of 3min.after 6min,the count rate was observed to be...

A substance has a half life of 3min.after 6min,the count rate was observed to be...

A substance has a half life of 3min.after 6min,the count rate was observed to be 400.what is the count rate after zero time? please show ur workings?
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Asked by sharhedy on 1st May, 2014
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