The activity of a radioactive sample is measured. The activity, corected
for background radiation is found to be 240 Bq. The activity is measured
again after 1 hour 30 minutes and is now 30 Bq. What is the half-life ofte
sample?
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On the basis of composition, matter can be classified as compound, element and mixture. Solids, liquids and gases are physical states of matter
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