Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory, where it is determined that the activity of the sample is 0.144 Bq/g
By comparing this activity with the activity of living organic matter,
0.230 Bq/g, the scientist determines how old the wood sample is, or more precisely, when the tree that the sample came from died. How old is the sample of wood?
A) 3870 y
B) 4250 y
C) 4590 y
D) 2630 y
E) 2940 y
Answer: A
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The specific of ice is 2.10 kJ/kg 
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg 
and the heat of vaporization of water at 100
is 2256 kJ/kg. What is the final equilibrium temperature when 10.0 grams of ice at -15.0
is mixed with 3.00 grams of steam at 100
A. 60.2
B. 65.0
C. 70.2
D. 76.4
E. 80.3
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