How can a half-life be used to tell the age of a sample?
A) The half-life of an isotope is constant.
B) The amount of radioactive form depends on the amount of radiation in the surroundings.
C) The ratio between the radioactive form and the stable form depends on the archaeological record.
D) The ratio between the radioactive form and stable form varies regularly with time.
E) both C and D
Answer: D
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Resistors in Combination: What is the equivalent resistance in the circuit shown in the figure?
A. 80 ? B. 55 ? C. 50 ? D. 35 ?
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Fill in the blank(s) with the appropriate word(s).
Most spiral galaxies have rotation curves that
A) decrease rapidly with increasing radius in the disk, indicating no dark matter is present. B) increase drastically with increasing radius. C) decrease rapidly with increasing radius in the disk, indicating the presence of dark matter. D) stay constant out to large radii in the disk, indicating that no dark matter is present. E) stay constant out to large radii in the disk, indicating the presence of dark matter.