The radioactivity due to carbon-14 measured in a piece of a wood from an ancient site was found to produce 20 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produced 160 counts per minute. The half-life of carbon-14, a beta emitter, is 5730 y. The age of the artifact is closest to
A) 15,000 y. B) 23,000 y. C) 5700 y. D) 17,000 y. E) 12,000 y.
D
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Two mechanical waves meet and coincide. One wave has a positive displacement from the equilibrium position, and the other wave has a negative displacement. What kind of interference occurs?
a. constructive b. destructive c. complete constructive d. none
The conclusion that everywhere in the Universe galaxies, stars, and planets are distributed similarly (i.e. there is no "preferred" location or center or edge) is called
a. deduction. b. the cosmological principle. c. Ockham's Razor. d. the similarity principle. e. reduction.
Exclusion Principle: For the ground state of the hydrogen atom, which of the following numbers represents the correct value of the orbital angular momentum quantum number?
A. -1 B. 1 C. 0 D. 2 E. -2
The focal length of a convex mirror is has a magnitude of 20 cm. What is its radius of curvature?
A) 40 cm B) -10 cm C) 20 cm D) -40 cm E) -20 cm