A 1-gram sample of wood is taken from an ancient site. If the Carbon-14 activity of the sample is 30.5% that of present-day organic material, what is the age of the wood? (T1/2 for 14C is 5 730 years)
a. 3,980 years
b. 6,800 years
c. 5,200 years
d. 9,820 years
e. 10,920 years
d
Physics & Space Science
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Indicate whether the statement is true or false
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A 1.5 kg ball is floating in water. The volume displaced by the ball is
A. 0.0015 
B. 0.0027
C. 0.0036
D. 0.0040
E. 0.0051
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The preferred name of Cu2S is ______________
Fill in the blank(s) with correct word
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