Carbon-14 has a half-life of 5730 years. 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 years
B)
4250 years
C)
4590 years
D)
2630 years
E)
2940 years
A
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The auxiliary power unit (APU) on a jetliner is a generator and operates on the principle of __________________
Fill in the blank(s) with correct word
A vertical wire carries a current straight up in a region where the magnetic field vector points due North. What is the direction of the resulting force on this current?
A) North B) downward C) East D) West E) South
Resistance and Resistivity: The resistivity of a 1.0 m long copper wire is 1.72 × 10-8 ? ? m and its cross sectional area is 2.0 × 10-6 m2. If the wire carries a current of 0.20 A, what is the voltage across the wire?
A. 17 mV B. 0.90 mV C. 1.7 mV D. 10 mV E. 90 mV
Entropy and temperature measure different properties of a sample of a substance, because temperature gauges average kinetic energy of molecules or atoms, but
A. entropy of an isolated system cannot decrease. B. entropy measures disorderliness or unruliness. C. low entropy substances cannot have a temperature. D. entropy is the inverse of temperature, due to conservation of momentum.