The radiocarbon content of 14C decreases after the death of a living system with a half-life of 5730 y. If an archaeologist working a dig finds an ancient firepit containing some partially consumed firewood and the wood contains only 12.5 percent of the 14C content of an equal carbon sample from a present-day tree, what is the age of the ancient site?
17 190 years
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A 2.0-C charge moves with a velocity of 
m/s and experiences a magnetic force of 
N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field.
A. ?3.0 T B. +3.0 T C. +5.0 T D. ?5.0 T E. +6.0 T
A mirage is a result of atmospheric
A) reflection. B) refraction. C) scattering. D) dispersion. E) aberrations.
An ideal diode in an ac circuit
A. doubles the current. B. halves the current. C. permits the current to flow in only one direction. D. permits the current to flow in one direction and double the current to flow in the other. E. permits the current to flow in one direction and half the current to flow in the other.
The solubility parameter of polycarbonate is 20.3 (MPa)0.5 and for carbon disulfide it is 20.4 (MPa)0.5. Should carbon disulfide dissolve polycarbonate? _____________
Fill in the blank(s) with the appropriate word(s).