At some instant of time the activity of a sample of radioactive material is 3.2

Question

                                     At some instant of time the activity of a                                                       sample of radioactive material is 3.2 microCi.                                                       If the sample contains 1.4                                      At some instant of time the activity of a                                                       sample of radioactive material is 3.2 microCi.                                                       If the sample contains 1.4                     At some instant of time the activity of a                                      sample of radioactive material is 3.2 microCi.                                      If the sample contains 1.4

Explanation / Answer

decay constant= activity/ radioactive nuclei= 3.2*10^-6* 3.7*10^10 / 1.4*10^9 =8.46*10^-5

half life= ln(2)/ decay constant = 8193.23s =136min 33 s

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