24. Strontium-90 is radioactive and has a h life of 28.8 years. The activity of

Question

24. Strontium-90 is radioactive and has a h life of 28.8 years. The activity of a 4.1 mg sample of strontium- half 90 is 2.1 x 1010 becquerels. Calculate the activity in curies. lecture 40 a) 1.4x 106 Ci b) 1.6 x 103 Ci c) 9.8 x 10 Ci d) 87. Ci e) 0.57 Ci 25. The half life for the decay of carbon-14 is 5.73 x 10 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 64. Bc The activity in a similar-sized sample of fresh wood is measured to be 71. Bq. Calculate the age of the artifact. Lecture 40 a) 9.0 x 102 years b) 1.3 x 10 years c) 8.6 x 102 years d) 4.4 x 102 years e) 5.7 x 102 years

Explanation / Answer

Q24

Change Bequerel to Curies

2.1*10^10 Bequerel to curies

1 Bq = 2.7027027027027*10-11 Ci

then

Curies = (2.1*10^10 )* (2.702702*10^-11) = 0.567

chose E

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