The number of radioactive nuclei present at the start of an
The number of radioactive nuclei present at the start of an experiment is 4.20 *1015. The number present 23 days later is7.84 *1014. Evaluate the half-life of the nuclei?
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the number of radioactive nuclei present at the start of an experiment is 420 1015 the number present 23 days later
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